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150-1060: The Revised Julian calendar has been adopted for ecclesiastical use by the Ecumenical Patriarchate of Constantinople , the Orthodox Autocephalous Church of Albania , the Greek Orthodox Church of Alexandria , the Greek Orthodox Church of Antioch , the Bulgarian Orthodox Church , the Romanian Orthodox Church , the Cypriot Orthodox Church , the Church of Greece , the Orthodox Church of the Czech Lands and Slovakia ,

300-448: A binary black hole . A second gravitational wave was detected on 26 December 2015 and additional observations should continue but gravitational waves require extremely sensitive instruments. The combination of observations made using electromagnetic radiation, neutrinos or gravitational waves and other complementary information, is known as multi-messenger astronomy . One of the oldest fields in astronomy, and in all of science,

450-467: A church council in 754 , which condemned the worship of images, after which many treasures were broken, burned, or painted over with depictions of trees, birds or animals: one source refers to the church of the Holy Virgin at Blachernae as having been transformed into a "fruit store and aviary". Following the death of his son Leo IV in 780, the empress Irene restored the veneration of images through

600-799: A patriarchate , numbering Moscow's bishop as fifth in rank behind the ancient patriarchates . The Russian Orthodox Church became the largest of the Eastern Orthodox churches in the world. As Ottoman rule weakened, various parts of the Orthodox Church that had been under the direct influence of the Ecumenical Patriarchate came to be independent. These churches at first usually declared their independence without universal approval, which came after Constantinople gave its blessing. The rate at which these new autocephalous ("self-headed") churches came into being increased in

750-462: A diocese of the Ecumenical Patriarchate, declared its independence in 1448 shortly before Constantinople fell owing to its protest over the Council of Florence , in which representatives of the patriarchate had signed onto union with Rome , trading doctrinal concessions for military aid against the encroaching Ottomans. The military aid never came and those concessions were subsequently repudiated by

900-562: A few milliseconds to thousands of seconds before fading away. Only 10% of gamma-ray sources are non-transient sources. These steady gamma-ray emitters include pulsars, neutron stars , and black hole candidates such as active galactic nuclei. In addition to electromagnetic radiation, a few other events originating from great distances may be observed from the Earth. In neutrino astronomy , astronomers use heavily shielded underground facilities such as SAGE , GALLEX , and Kamioka II/III for

1050-552: A model allows astronomers to select between several alternative or conflicting models. Theorists also modify existing models to take into account new observations. In some cases, a large amount of observational data that is inconsistent with a model may lead to abandoning it largely or completely, as for geocentric theory , the existence of luminiferous aether , and the steady-state model of cosmic evolution. Phenomena modeled by theoretical astronomers include: Modern theoretical astronomy reflects dramatic advances in observation since

1200-671: A number of important astronomers. Richard of Wallingford (1292–1336) made major contributions to astronomy and horology , including the invention of the first astronomical clock, the Rectangulus which allowed for the measurement of angles between planets and other astronomical bodies, as well as an equatorium called the Albion which could be used for astronomical calculations such as lunar , solar and planetary longitudes and could predict eclipses . Nicole Oresme (1320–1382) and Jean Buridan (1300–1361) first discussed evidence for

1350-578: A repeating cycle known as a saros . Following the Babylonians, significant advances in astronomy were made in ancient Greece and the Hellenistic world. Greek astronomy is characterized from the start by seeking a rational, physical explanation for celestial phenomena. In the 3rd century BC, Aristarchus of Samos estimated the size and distance of the Moon and Sun , and he proposed a model of

1500-608: A substantial amount of work in the realms of theoretical and observational physics. Some areas of study for astrophysicists include their attempts to determine the properties of dark matter , dark energy , and black holes ; whether or not time travel is possible, wormholes can form, or the multiverse exists; and the origin and ultimate fate of the universe . Topics also studied by theoretical astrophysicists include Solar System formation and evolution ; stellar dynamics and evolution ; galaxy formation and evolution ; magnetohydrodynamics ; large-scale structure of matter in

1650-865: A town a church should not be larger in size than the largest mosque. Many churches were converted into mosques (among them the Hagia Sophia and Chora Church in Constantinople , and the Rotunda and Hagios Demetrios in Thessaloniki ) or served for other uses (e.g. Hagia Irene in Constantinople, which became an armory for the Janissaries, and the Gül Mosque [Hagia Theodosia or Christ Euergetes], also in Constantinople, which after

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1800-654: A whole number of weeks. Therefore, a full repetition of the Revised Julian leap cycle with respect to the seven-day weekly cycle is seven times the cycle length = 7 × 900 = 6300 years. The following is a scatter plot of actual astronomical northward equinox moments as numerically integrated by SOLEX 11 using DE421 mode with extended (80-bit) floating point precision, high integration order (18th order), and forced solar mass loss ("forced" means taken into account at all times). SOLEX can automatically search for northern hemisphere spring equinox moments by finding when

1950-427: Is visible light , or more generally electromagnetic radiation . Observational astronomy may be categorized according to the corresponding region of the electromagnetic spectrum on which the observations are made. Some parts of the spectrum can be observed from the Earth's surface, while other parts are only observable from either high altitudes or outside the Earth's atmosphere. Specific information on these subfields

2100-524: Is a (non-exhaustive) list of these prerogatives and their reference points: In the eighth and ninth centuries the iconoclast movement caused serious political unrest throughout the Empire. The emperor Leo III issued a decree in 726 against images and ordered the destruction of an image of Christ over one of the doors of the Chalke, an act which was fiercely resisted by the citizens. Constantine V convoked

2250-590: Is a branch of astronomy that studies the universe as a whole. Astronomy is one of the oldest natural sciences. The early civilizations in recorded history made methodical observations of the night sky . These include the Egyptians , Babylonians , Greeks , Indians , Chinese , Maya , and many ancient indigenous peoples of the Americas . In the past, astronomy included disciplines as diverse as astrometry , celestial navigation , observational astronomy , and

2400-584: Is absorbed by the Earth's atmosphere, requiring observations at these wavelengths to be performed from the upper atmosphere or from space. Ultraviolet astronomy is best suited to the study of thermal radiation and spectral emission lines from hot blue stars ( OB stars ) that are very bright in this wave band. This includes the blue stars in other galaxies, which have been the targets of several ultraviolet surveys. Other objects commonly observed in ultraviolet light include planetary nebulae , supernova remnants , and active galactic nuclei. However, as ultraviolet light

2550-644: Is also a difficulty faced by the Patriarchate. In 2024, after the protests from Turkey, the signature of the Ecumenical Patriarchate has been removed from the statement of the June 2024 Ukraine peace summit . The affairs of the patriarchate are conducted by the Holy Synod , presided over by the Ecumenical Patriarch. The synod has existed since some time prior to the fourth century and assists

2700-595: Is also believed that the ruins at Great Zimbabwe and Timbuktu may have housed astronomical observatories. In Post-classical West Africa , Astronomers studied the movement of stars and relation to seasons, crafting charts of the heavens as well as precise diagrams of orbits of the other planets based on complex mathematical calculations. Songhai historian Mahmud Kati documented a meteor shower in August 1583. Europeans had previously believed that there had been no astronomical observation in sub-Saharan Africa during

2850-583: Is an inseparable part of the discipline of astrobiology. Astrobiology concerns itself with interpretation of existing scientific data , and although speculation is entertained to give context, astrobiology concerns itself primarily with hypotheses that fit firmly into existing scientific theories . This interdisciplinary field encompasses research on the origin of planetary systems , origins of organic compounds in space , rock-water-carbon interactions, abiogenesis on Earth, planetary habitability , research on biosignatures for life detection, and studies on

3000-821: Is composed of twelve hierarchs, each serving a year-long term, with half of the synod's members changing every six months in March and September. Astronomy Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics , physics , and chemistry in order to explain their origin and their overall evolution . Objects of interest include planets , moons , stars , nebulae , galaxies , meteoroids , asteroids , and comets . Relevant phenomena include supernova explosions, gamma ray bursts , quasars , blazars , pulsars , and cosmic microwave background radiation . More generally, astronomy studies everything that originates beyond Earth's atmosphere . Cosmology

3150-427: Is easily absorbed by interstellar dust , an adjustment of ultraviolet measurements is necessary. X-ray astronomy uses X-ray wavelengths . Typically, X-ray radiation is produced by synchrotron emission (the result of electrons orbiting magnetic field lines), thermal emission from thin gases above 10 (10 million) kelvins , and thermal emission from thick gases above 10 Kelvin. Since X-rays are absorbed by

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3300-546: Is exactly 24 seconds shorter than the Gregorian mean year of 365.2425 days, so in the long term on average the Revised Julian calendar pulls ahead of the Gregorian calendar by one day in 3600 years. The number of days per Revised Julian cycle = 900 × 365 + 218 = 328,718 days. Taking mod 7 leaves a remainder of 5, so like the Julian calendar, but unlike the Gregorian calendar, the Revised Julian calendar cycle does not contain

3450-414: Is founded on the detection and analysis of infrared radiation, wavelengths longer than red light and outside the range of our vision. The infrared spectrum is useful for studying objects that are too cold to radiate visible light, such as planets, circumstellar disks or nebulae whose light is blocked by dust. The longer wavelengths of infrared can penetrate clouds of dust that block visible light, allowing

3600-464: Is from these clouds that solar systems form. Studies in this field contribute to the understanding of the formation of the Solar System , Earth's origin and geology, abiogenesis , and the origin of climate and oceans. Astrobiology is an interdisciplinary scientific field concerned with the origins , early evolution , distribution, and future of life in the universe . Astrobiology considers

3750-416: Is given below. Radio astronomy uses radiation with wavelengths greater than approximately one millimeter, outside the visible range. Radio astronomy is different from most other forms of observational astronomy in that the observed radio waves can be treated as waves rather than as discrete photons . Hence, it is relatively easier to measure both the amplitude and phase of radio waves, whereas this

3900-568: Is most noticeable during Great Lent . Certain feast days are designed to fall during Lent, such as the feast of the Forty Martyrs of Sebaste . The Feast of the Annunciation is also intended to fall either before Easter or during Bright Week . Sometimes, Annunciation will fall on the day of Easter itself, a very special concurrence known as Kyrio-Pascha , with special liturgical practices appointed for such an occurrence. However, under

4050-645: Is not as easily done at shorter wavelengths. Although some radio waves are emitted directly by astronomical objects, a product of thermal emission , most of the radio emission that is observed is the result of synchrotron radiation , which is produced when electrons orbit magnetic fields . Additionally, a number of spectral lines produced by interstellar gas , notably the hydrogen spectral line at 21 cm, are observable at radio wavelengths. A wide variety of other objects are observable at radio wavelengths, including supernovae , interstellar gas, pulsars , and active galactic nuclei . Infrared astronomy

4200-545: Is now Greece , Asia Minor , Pontus , and Thrace . With the development of the hierarchical structure of the Church, the bishop of Constantinople came to be styled as exarch (a position superior to metropolitan). Constantinople was recognized as the fourth patriarchate at the First Council of Constantinople in 381, after Antioch , Alexandria , and Rome . The patriarch was usually appointed by Antioch. Because of

4350-475: Is one of the few sciences in which amateurs play an active role . This is especially true for the discovery and observation of transient events . Amateur astronomers have helped with many important discoveries, such as finding new comets. Astronomy (from the Greek ἀστρονομία from ἄστρον astron , "star" and -νομία -nomia from νόμος nomos , "law" or "culture") means "law of the stars" (or "culture of

4500-627: Is one of the fifteen to seventeen autocephalous churches that together compose the Eastern Orthodox Church . It is headed by the Ecumenical Patriarch of Constantinople . Because of its historical location as the capital of the former Eastern Roman (Byzantine) Empire and its role as the mother church of most modern Orthodox churches, Constantinople holds a special place of honor within Orthodoxy and serves as

4650-479: Is the branch of astronomy that employs the principles of physics and chemistry "to ascertain the nature of the astronomical objects , rather than their positions or motions in space". Among the objects studied are the Sun , other stars , galaxies , extrasolar planets , the interstellar medium and the cosmic microwave background . Their emissions are examined across all parts of the electromagnetic spectrum , and

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4800-502: Is the measurement of the positions of celestial objects. Historically, accurate knowledge of the positions of the Sun, Moon, planets and stars has been essential in celestial navigation (the use of celestial objects to guide navigation) and in the making of calendars . Careful measurement of the positions of the planets has led to a solid understanding of gravitational perturbations , and an ability to determine past and future positions of

4950-597: The Albanian Orthodox Church declared its autocephaly, being granted recognition of it in 1937. In addition to these churches, whose territory had been agreed upon by all as within Constantinople's jurisdiction, several other disputed areas' Eastern Orthodox churches have had recognition by the Ecumenical Patriarchate as either autocephalous or autonomous , including the Finnish Orthodox Church and Estonian Orthodox Church in 1923,

5100-615: The Archons of the Ecumenical Patriarchate , usually important laymen who make large donations for the upkeep of the Patriarchate. In turn, they are granted honorary titles which once belonged to members of the Patriarchal staff in centuries past. The Patriarchate acts in the capacity of being an intermediary and facilitator between the Orthodox churches and also in relations with other Christians and religions. This role sometimes brings

5250-595: The Church of the Holy Sepulchre in Jerusalem (35°13′47.2″ E or UT+22055 for the small dome) during which the first full moon after the vernal equinox occurs. Although the instant of the full moon must occur after the instant of the vernal equinox, it may occur on the same day. If the full moon occurs on a Sunday, Easter is the following Sunday. Churches that adopted this calendar did so on varying dates. However, all Eastern Orthodox churches continue to use

5400-484: The Compton Gamma Ray Observatory or by specialized telescopes called atmospheric Cherenkov telescopes . The Cherenkov telescopes do not detect the gamma rays directly but instead detect the flashes of visible light produced when gamma rays are absorbed by the Earth's atmosphere. Most gamma-ray emitting sources are actually gamma-ray bursts , objects which only produce gamma radiation for

5550-476: The Council of Chalcedon in 451 recognized an expansion of the boundaries of the Patriarchate of Constantinople and of its authority over bishops of dioceses "among the barbarians", which has been variously interpreted as referring either to areas outside the Byzantine Empire or to non-Greeks. The council resulted in a schism with the Patriarchate of Alexandria. In any case, for almost a thousand years

5700-524: The Earth's atmosphere , all X-ray observations must be performed from high-altitude balloons , rockets , or X-ray astronomy satellites . Notable X-ray sources include X-ray binaries , pulsars , supernova remnants , elliptical galaxies , clusters of galaxies , and active galactic nuclei . Gamma ray astronomy observes astronomical objects at the shortest wavelengths of the electromagnetic spectrum. Gamma rays may be observed directly by satellites such as

5850-579: The Latin Empire of Constantinople was established, and Byzantine refugees founded their own successor states, the most notable of these being the Empire of Nicaea under Theodore Lascaris (a relative of Alexius III ), the Empire of Trebizond , and the Despotate of Epirus . The new seat of the Patriarchate was established in the city of Nicaea until in 1261, when Constantinople was reconquered by

6000-977: The Milky Way , as its own group of stars was only proven in the 20th century, along with the existence of "external" galaxies. The observed recession of those galaxies led to the discovery of the expansion of the Universe . In 1919, when the Hooker Telescope was completed, the prevailing view was that the universe consisted entirely of the Milky Way Galaxy. Using the Hooker Telescope, Edwin Hubble identified Cepheid variables in several spiral nebulae and in 1922–1923 proved conclusively that Andromeda Nebula and Triangulum among others, were entire galaxies outside our own, thus proving that

6150-794: The Muslim world by the early 9th century. In 964, the Andromeda Galaxy , the largest galaxy in the Local Group , was described by the Persian Muslim astronomer Abd al-Rahman al-Sufi in his Book of Fixed Stars . The SN 1006 supernova , the brightest apparent magnitude stellar event in recorded history, was observed by the Egyptian Arabic astronomer Ali ibn Ridwan and Chinese astronomers in 1006. Iranian scholar Al-Biruni observed that, contrary to Ptolemy ,

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6300-1008: The Orthodox Church in America and the Orthodox Church of Ukraine . It has not been adopted by the Russian Orthodox Church , the Serbian Orthodox Church , the Macedonian Orthodox Church , the Georgian Orthodox Church , the Polish Orthodox Church and the Greek Orthodox Patriarchate of Jerusalem . It has not been adopted by any nation as an official calendar. Instead, all of the Eastern Orthodox nations have adopted

6450-599: The Polish Orthodox Church in 1924, and the Czech and Slovak Orthodox Church in 1998. The majority of these disputes are a result of the expansion of the Russian Empire , which often included a subjugation of the Orthodox churches in conquered lands to the Moscow Patriarchate. Due to this, the Moscow Patriarchate often disputes the Ecumenical Patriarch's role as prime representative and spiritual leader of

6600-561: The Renaissance , Nicolaus Copernicus proposed a heliocentric model of the solar system. His work was defended by Galileo Galilei and expanded upon by Johannes Kepler . Kepler was the first to devise a system that correctly described the details of the motion of the planets around the Sun. However, Kepler did not succeed in formulating a theory behind the laws he wrote down. It was Isaac Newton , with his invention of celestial dynamics and his law of gravitation , who finally explained

6750-561: The Solar System where the Earth and planets rotated around the Sun, now called the heliocentric model. In the 2nd century BC, Hipparchus discovered precession , calculated the size and distance of the Moon and invented the earliest known astronomical devices such as the astrolabe . Hipparchus also created a comprehensive catalog of 1020 stars, and most of the constellations of the northern hemisphere derive from Greek astronomy. The Antikythera mechanism ( c.  150 –80 BC)

6900-427: The interstellar medium . The study of the abundance of elements and isotope ratios in Solar System objects, such as meteorites , is also called cosmochemistry , while the study of interstellar atoms and molecules and their interaction with radiation is sometimes called molecular astrophysics. The formation, atomic and chemical composition, evolution and fate of molecular gas clouds is of special interest, because it

7050-657: The "Great Church of Christ" and it was the touchstone and reference point for ecclesiastical affairs in the East, whether in terms of church government, relations with the state, or liturgical matters. In history and in canonical literature (i.e. the Church's canons and traditional commentaries on them), the Ecumenical Patriarchate has been granted certain prerogatives ( πρεσβεία , presveía ) that other autocephalous Orthodox churches do not have. Not all of these prerogatives are today universally acknowledged, though all do have precedents in history and canonical references. The following

7200-442: The 1990s, including studies of the cosmic microwave background , distant supernovae and galaxy redshifts , which have led to the development of a standard model of cosmology . This model requires the universe to contain large amounts of dark matter and dark energy whose nature is currently not well understood, but the model gives detailed predictions that are in excellent agreement with many diverse observations. Astrophysics

7350-411: The 19th century, particularly with the independence of Greece. In 1833, the Church of Greece declared its autocephaly, which was subsequently recognized by the patriarchate in 1850. In 1865, the Romanian Orthodox Church , against the protests of Constantinople, declared its independence, which was acknowledged in 1885. A year before Greece's autocephaly was self-proclaimed, the Serbian Orthodox Church

7500-566: The Byzantine Emperor Michael VIII Palaiologos . In accordance with the traditional custom at the time, Sultan Mehmed II allowed his troops and his entourage three full days of unbridled pillage and looting in the city shortly after it was captured. Once the three days passed, he would then claim its remaining contents for himself. However, by the end of the first day, he proclaimed that the looting should cease as he felt profound sadness when he toured

7650-663: The Conquest served for a while as a naval dockyard). Such rules, however, although very strict in the beginning, with time and the increasing importance in the Ottoman Empire of the Rum millet were increasingly disregarded, so that in the 19th century in Istanbul there was a veritable building boom of Orthodox churches, many among them having high bell towers and brick domes, both of which had previously been strictly Since 1586

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7800-403: The Earth's atmosphere and of their physical and chemical properties", while "astrophysics" refers to the branch of astronomy dealing with "the behavior, physical properties, and dynamic processes of celestial objects and phenomena". In some cases, as in the introduction of the introductory textbook The Physical Universe by Frank Shu , "astronomy" may be used to describe the qualitative study of

7950-580: The Ecumenical Patriarchate has had its headquarters in the Church of St George in the Fener (Phanar) district of Istanbul. The current territory of the Patriarchate is significantly reduced from what it was at its height. Its canonical territory currently includes most of modern Turkey , northern Greece and Mount Athos , the Dodecanese and Crete . By its interpretation of Canon 28 of Chalcedon, Constantinople also claims jurisdiction over all areas outside

8100-629: The Ecumenical Patriarchate, primarily in the Greek Orthodox Archdiocese of America . The Patriarchate also enjoys an even greater majority in the United Kingdom . Furthermore, the Albanian, Rusyn and Ukrainian jurisdictions in America are also part of the Patriarchate. Most of the Patriarchate's funding does not come directly from its member churches but rather from the government of Greece, due to an arrangement whereby

8250-504: The Great moved his residence to the town renaming it Nova Roma ( Νέα Ῥώμη ), or "New Rome". Thenceforth, the importance of the church there grew, along with the influence of its bishop. Prior to the moving of the imperial capital, the bishop of Byzantium had been under the authority of the metropolitan of Heraclea , but from the 4th century on, he grew to become independent in his own right and even to exercise authority throughout what

8400-429: The Greek government and Greek Orthodox Church was set up to look into the question of calendar reform. It reported in January 1923. In the end, for civil purposes, the Gregorian calendar was adopted; the changeover went into effect on 16 February 1923/1 March 1923. After the promulgation of the royal decree, the Ecumenical Patriarch, Patriarch Meletius IV of Constantinople , issued an encyclical on 3 February recommending

8550-447: The Gregorian and Revised Julian calendars, respectively, accepted a modest amount of medium-term equinox wobble for the sake of traditionally perceived leap rule mental arithmetic simplicity. Therefore, the wobble is essentially a curiosity that is of no practical or ritual concern. The new calendar has been adopted by Orthodox churches as follows: Adopting churches are known as New Calendarists . The new calendar has not been adopted by

8700-421: The Gregorian calendar as the official state calendar. The Revised Julian calendar has the same months and month lengths as the Julian and Gregorian calendar, but, in the Revised Julian version, years evenly divisible by 100 are not leap years , except that years with remainders of 200 or 600 when divided by 900 remain leap years, e.g. 2000 and 2400 as in the Gregorian calendar. A committee composed of members of

8850-430: The J2000.0-relative Universal Time moments, which were then properly converted to Revised Julian dates and Jerusalem local apparent time , taking local apparent midnight as the beginning of each calendar day. The year range of the chart was limited to dates before the year AD 4400: by then Δ T is expected to accumulate to about six hours, with an uncertainty of less than 2 + 1 ⁄ 2 hours. The chart shows that

9000-519: The Julian calendar to determine the date of Easter (except for the Finnish Orthodox Church , which now uses the Gregorian Easter; the Estonian Orthodox Church used the Gregorian Easter from 1923 to 1945). The following are Gregorian minus Revised Julian date differences, calculated for the beginning of January and March in each century year, which is where differences arise or disappear, until AD 10000. These are exact arithmetic calculations, not depending on any astronomy. A negative difference means that

9150-400: The Latins were astounded at the riches they found. Though the Venetians had an appreciation for the art which they discovered (they were themselves semi-Byzantines) and saved much of it, the French and others destroyed indiscriminately, halting to refresh themselves with wine, violation of nuns, and murder of Orthodox clerics. The Crusaders vented their hatred for the Greeks most spectacularly in

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9300-423: The Lombard catepan of Italy , Argyrus , who had spent years in Constantinople, originally as a political prisoner. Patriarch Michael I Cerularius ordered a letter to be written to John, the Bishop of Trani in which he attacked the "Judaistic" practices of the West, namely the use of unleavened bread. The letter was to be sent by John to all the bishops of the West, including the Pope. John promptly complied and

9450-427: The Nicene-Constantinopolitan Creed. As Bishop Kallistos Ware writes, "Even after 1054 friendly relations between East and West continued. The two parts of Christendom were not yet conscious of a great gulf of separation between them. […] The dispute remained something of which ordinary Christians in East and West were largely unaware". In fact, efforts were made in subsequent centuries by Popes and Patriarchs to heal

9600-431: The Orthodox churches of Georgia , Jerusalem , Macedonia , Mount Athos , Russia , Serbia , Ukrainian Orthodox Church (Moscow Patriarchate) (status is not defined), nor by the Greek Old Calendarists . There were attempts to introduce Revised Julian as a religious calendar in the Soviet Union. On 12 June 1923, it was accepted by the short-lived schismatic Renovationist Church , which had seized church buildings with

9750-413: The Patriarch of Constantinople presided over the church in the Eastern Roman (Byzantine) Empire and its missionary activity that brought the Christian faith in its Byzantine form to many peoples north of the imperial borders. The cathedral church of Constantinople, Hagia Sophia (Holy Wisdom), was the center of religious life in the eastern Christian world. The Ecumenical Patriarchate came to be called

9900-399: The Patriarchate had transferred property it had owned to Greece. In exchange, the employees, including the clergy, of the Patriarchate are remunerated by the Greek government. The Greek Orthodox Archdiocese of America provides substantial support through an annual contribution, known as the logia , and its institutions, including the American-based Greek Orthodox Ladies Philoptochos Society and

10050-407: The Patriarchate into conflict with other Orthodox churches, as its role in the church is debated. The question centers around whether the Ecumenical Patriarchate is simply the most honored among the Orthodox churches or whether it has any real authority or prerogatives ( πρεσβεία , presveía ) that differ from the other autocephalous churches. This dispute is often between Constantinople and Moscow,

10200-472: The Sun's apogee (highest point in the heavens) was mobile, not fixed. Some of the prominent Islamic (mostly Persian and Arab) astronomers who made significant contributions to the science include Al-Battani , Thebit , Abd al-Rahman al-Sufi , Biruni , Abū Ishāq Ibrāhīm al-Zarqālī , Al-Birjandi , and the astronomers of the Maragheh and Samarkand observatories. Astronomers during that time introduced many Arabic names now used for individual stars . It

10350-472: The Sun, the Moon and the stars rotating around it. This is known as the geocentric model of the Universe, or the Ptolemaic system , named after Ptolemy . A particularly important early development was the beginning of mathematical and scientific astronomy, which began among the Babylonians , who laid the foundations for the later astronomical traditions that developed in many other civilizations. The Babylonians discovered that lunar eclipses recurred in

10500-411: The Turks, had they taken the city, would not have been as cruel as the Latin Christians. The defeat of Byzantium, already in a state of decline, accelerated political degeneration so that the Byzantines eventually became an easy prey to the Turks. The Crusading movement thus resulted, ultimately, in the victory of Islam, a result which was of course the exact opposite of its original intention. Meanwhile,

10650-409: The age of the Universe and size of the Observable Universe. Theoretical astronomy led to speculations on the existence of objects such as black holes and neutron stars , which have been used to explain such observed phenomena as quasars , pulsars , blazars , and radio galaxies . Physical cosmology made huge advances during the 20th century. In the early 1900s the model of the Big Bang theory

10800-586: The agency of the Second Council of Nicaea in 787. The iconoclast controversy returned in the early 9th century, only to be resolved once more in 843 during the regency of Empress Theodora, who restored the icons. The relations between the papacy and the Byzantine court were good in the years leading up to 1054. The emperor Constantine IX and the Pope Leo IX were allied through the mediation of

10950-1035: The appearance of a cross in the sky, visible to thousands on the feast of the Exaltation of the Holy Cross, 1925, of which eyewitness accounts were recorded. Ecumenical Patriarchate of Constantinople Autocephaly recognized by some autocephalous Churches de jure : Autocephaly and canonicity recognized by Constantinople and 3 other autocephalous Churches: Spiritual independence recognized by Georgian Orthodox Church: Semi-Autonomous: The Ecumenical Patriarchate of Constantinople ( Greek : Οἰκουμενικὸν Πατριαρχεῖον Κωνσταντινουπόλεως , romanized :  Oikoumenikón Patriarkhíon Konstantinoupóleos , IPA: [ikumeniˈkon patriarˈçion konstandinuˈpoleos] ; Latin : Patriarchatus Oecumenicus Constantinopolitanus ; Turkish : Rum Ortodoks Patrikhanesi, İstanbul Ekümenik Patrikhanesi , "Roman Orthodox Patriarchate, Ecumenical Patriarchate of Istanbul")

11100-486: The atmosphere itself produces significant infrared emission. Consequently, infrared observatories have to be located in high, dry places on Earth or in space. Some molecules radiate strongly in the infrared. This allows the study of the chemistry of space; more specifically it can detect water in comets. Historically, optical astronomy, which has been also called visible light astronomy, is the oldest form of astronomy. Images of observations were originally drawn by hand. In

11250-449: The authority of the legates to issue such a bull is unclear. The legates left for Rome two days after issuing the bull of excommunication, leaving behind a city near riot. The patriarch had the immense support of the people against the emperor, who had supported the legates to his own detriment. To assuage popular anger, the bull was burnt, and the legates were anathematised . Only the legates were anathematised and, in this case too, there

11400-567: The beginning of the schism. The full schism was not actually consummated by the seemingly mutual excommunications. The New Catholic Encyclopedia reports that the legates had been careful not to intimate that the bull of excommunication implied a general excommunication of the Byzantine Church. The bull excommunicated only Cerularius, Leo of Achrida, and their adherents. Thus, the New Catholic Encyclopedia argues that

11550-585: The calendar's adoption by Orthodox churches, which is why it is sometimes also known as the Meletian Calendar . The matter came up for discussion at the Council of Constantinople (1923) , which deliberated in May and June. Subsequently, it was adopted by several of the autocephalous Orthodox churches. The synod was chaired by Meletius IV and representatives were present from the churches of Cyprus, Greece, Romania and Serbia . There were no representatives of

11700-620: The canonically defined territories of other Orthodox churches, which includes the entire Western hemisphere , Oceania , the United Kingdom , Western Europe , Northeast Asia , Southeast Asia . This claim is disputed by other autocephalous churches with dioceses in those areas, as well as the Turkish government. The Orthodox presence in Turkey itself is small; however the majority of Orthodox in North America (about two-thirds) are under

11850-411: The change in calendar as an unwarranted innovation, influenced by Western society . They say that no sound theological reason has been given for changing the calendar, that the only reasons advanced are social. The proposal for change was introduced by Meletios Metaxakis , Ecumenical Patriarch of Constantinople , a patriarch whose canonical status has been disputed. The argument is also made that since

12000-462: The crusaders inflicted a severe sacking on Constantinople for three days, during which many ancient and medieval Roman and Greek works were either stolen or destroyed. Despite their oaths and the threat of excommunication, the Crusaders ruthlessly and systematically violated the city's holy sanctuaries, destroying, defiling, or stealing all they could lay hands on; nothing was spared. It was said that

12150-453: The day the Turks made a great slaughter of Christians through the city". According to historian Philip Mansel , widespread persecution of the city's civilian inhabitants took place, resulting in thousands of murders and rapes, and 30,000 civilians being enslaved or forcibly deported. George Sphrantzes says that people of both genders were raped inside Hagia Sophia . After Constantinople

12300-409: The day. In its decision the conference noted that "the difference between the length of the political year of the new calendar and the Gregorian is so small that only after 877 years it is observed difference of dates." The same decision provided that the coming 1 October should be called 14 October , thus dropping thirteen days. It then adopted the leap year rule of Milanković. The proposed calendar

12450-405: The decision made by the council of bishops at Nicaea to decree that all local churches celebrate Easter on the same day. The emperor Constantine, writing to the bishops absent from the council to notify them of the decision, argued, "Think, then, how unseemly it is, that on the same day some should be fasting whilst others are seated at a banquet". Liturgical objections to the new calendar stem from

12600-618: The defense of Orthodox Christian traditions. Prominent issues for the Ecumenical Patriarchate's policy in the 21st century include the safety of the believers in the Middle East , reconciliation of the Eastern Orthodox and Catholic churches, and the reopening of the Theological School of Halki , which was closed down by the Turkish authorities in 1971. In the year 330 the Roman Emperor Constantine

12750-408: The department is historically affiliated with a physics department, and many professional astronomers have physics rather than astronomy degrees. Some titles of the leading scientific journals in this field include The Astronomical Journal , The Astrophysical Journal , and Astronomy & Astrophysics . In early historic times, astronomy only consisted of the observation and predictions of

12900-513: The desecration of the greatest Church in Christendom. They smashed the silver iconostasis, the icons and the holy books of Hagia Sophia, and seated upon the patriarchal throne a whore who sang coarse songs as they drank wine from the Church's holy vessels. The estrangement of East and West, which had proceeded over the centuries, culminated in the horrible massacre that accompanied the conquest of Constantinople. The Greeks were convinced that even

13050-474: The detection of neutrinos . The vast majority of the neutrinos streaming through the Earth originate from the Sun , but 24 neutrinos were also detected from supernova 1987A . Cosmic rays , which consist of very high energy particles (atomic nuclei) that can decay or be absorbed when they enter the Earth's atmosphere, result in a cascade of secondary particles which can be detected by current observatories. Some future neutrino detectors may also be sensitive to

13200-451: The dispute need not have produced a permanent schism any more than excommunication of any "contumacious bishop". The schism began to develop when all the other Eastern patriarchs supported Cerularius. According to the New Catholic Encyclopedia, it was the support of Emperor Michael VI Stratiotikos that impelled them to support Cerularius. Some have questioned the validity of the bull on the grounds that Pope Leo IX had died at that time and so

13350-442: The fact that it adjusts only those liturgical celebrations that occur on fixed calendar dates, leaving all of the commemorations on the moveable cycle on the original Julian calendar. This upsets the harmony and balance of the liturgical year . (This would not have been a problem if the recommendations of the 1923 synod to use an astronomical rule to reckon the date of Easter, as outlined above, had not been rejected.) This disruption

13500-458: The gradual shift in the Julian calendar will somehow negatively affect the celebration of feasts that are linked to the seasons of the year. However, opponents counter that the seasons are reversed in the southern hemisphere , where the liturgical celebrations are no less valid. The validity of this argument is questionable, since the feasts of the Orthodox Church were not changed no matter where they were celebrated, and Orthodox services were held in

13650-468: The importance of the position of Constantinople's church at the center of the Roman Empire, affairs involving the various churches outside Constantinople's direct authority came to be discussed in the capital, particularly where the intervention of the emperor was desired. The patriarch naturally became a liaison between the emperor and bishops traveling to the capital, thus establishing the position of

13800-514: The influence of the patriarchate at its capital. This influence came to be enshrined in Orthodox canon law , to such an extent that it was elevated even beyond more ancient patriarchates: Canon 3 of the First Council of Constantinople (381) stated that the bishop of that city "shall have primacy of honor after the Bishop of Rome because Constantinople is the New Rome." In its disputed 28th Canon,

13950-414: The introduction of new technology, including the spectroscope and photography . Joseph von Fraunhofer discovered about 600 bands in the spectrum of the Sun in 1814–15, which, in 1859, Gustav Kirchhoff ascribed to the presence of different elements. Stars were proven to be similar to the Earth's own Sun, but with a wide range of temperatures , masses , and sizes. The existence of the Earth's galaxy,

14100-530: The largest Orthodox church in terms of population, especially as expressed in the Third Rome theory which places Moscow in the place of Constantinople as the center of world Orthodoxy. Such disputes sometimes result in temporary breaks in full communion , though usually not for very long. The relationship between Constantinople and the Ottoman Empire was frequently bitter, due in no small part to

14250-579: The late 19th century and most of the 20th century, images were made using photographic equipment. Modern images are made using digital detectors, particularly using charge-coupled devices (CCDs) and recorded on modern medium. Although visible light itself extends from approximately 4000 Å to 7000 Å (400 nm to 700 nm), that same equipment can be used to observe some near-ultraviolet and near-infrared radiation. Ultraviolet astronomy employs ultraviolet wavelengths between approximately 100 and 3200 Å (10 to 320 nm). Light at those wavelengths

14400-570: The legates' authority legally ceased, but they effectively ignored this technicality. In response to Michael's refusal to address the issues at hand, the legatine mission took the extreme measure of entering the church of the Hagia Sophia during the Divine Liturgy and placing a bull of excommunication on the altar. The events of the East-West Schism are generally dated from the acts of 1054. However, these events only triggered

14550-458: The letter was passed to Humbert of Mourmoutiers , the cardinal-bishop of Silva Candida , who translated the letter into Latin and brought it to the Pope, who ordered a reply to be made to each charge and a defence of papal supremacy to be laid out in a response. Although he was hot-headed, Michael was convinced to cool the debate and thus attempt to prevent the impending breach. However, Humbert and

14700-425: The long-term equinox drift of the Revised Julian calendar is quite satisfactory, at least until AD 4400. The medium-term wobble spans about two days because, like the Gregorian calendar, the leap years of the Revised Julian calendar are not smoothly spread: they occur mostly at intervals of four years but there are occasional eight-year gaps (at 7 out of 9 century years). Evidently each of the authorities responsible for

14850-635: The looted and enslaved city. Hagia Sophia was not exempted from the pillage and looting and specifically became its focal point as the invaders believed it to contain the greatest treasures and valuables of the city. Shortly after the defence of the Walls of Constantinople collapsed and the Ottoman troops entered the city victoriously, the pillagers and looters made their way to the Hagia Sophia and battered down its doors before storming in. Throughout

15000-576: The making of calendars . Professional astronomy is split into observational and theoretical branches. Observational astronomy is focused on acquiring data from observations of astronomical objects. This data is then analyzed using basic principles of physics. Theoretical astronomy is oriented toward the development of computer or analytical models to describe astronomical objects and phenomena. These two fields complement each other. Theoretical astronomy seeks to explain observational results and observations are used to confirm theoretical results. Astronomy

15150-410: The metaphorical and spiritual sun who fulfills Malachi's prophetic words: "the sun of righteousness will shine with healing in its wings" (Malachi 4:2). The identification, based on this prophecy, of Jesus Christ as the "sun of righteousness" is found many times in writings of the early Church fathers and follows from many New Testament references linking Jesus with imagery of sun and light. Critics see

15300-593: The motions of objects visible to the naked eye. In some locations, early cultures assembled massive artifacts that may have had some astronomical purpose. In addition to their ceremonial uses, these observatories could be employed to determine the seasons, an important factor in knowing when to plant crops and in understanding the length of the year. As civilizations developed, most notably in Egypt , Mesopotamia , Greece , Persia , India , China , and Central America , astronomical observatories were assembled and ideas on

15450-417: The motions of the planets. Newton also developed the reflecting telescope . Improvements in the size and quality of the telescope led to further discoveries. The English astronomer John Flamsteed catalogued over 3000 stars. More extensive star catalogues were produced by Nicolas Louis de Lacaille . The astronomer William Herschel made a detailed catalog of nebulosity and clusters, and in 1781 discovered

15600-462: The nature of the Universe began to develop. Most early astronomy consisted of mapping the positions of the stars and planets, a science now referred to as astrometry . From these observations, early ideas about the motions of the planets were formed, and the nature of the Sun, Moon and the Earth in the Universe were explored philosophically. The Earth was believed to be the center of the Universe with

15750-532: The new calendar is the known errors of the Julian calendar, which will in the course of time lead to a situation in which those following the Julian calendar (in the Northern Hemisphere) will be reckoning the month of December (and the feast of Christ's Nativity) during the heat of summer, August and its feasts during the deep cold of winter, Easter during the autumn season, and the November feasts in

15900-406: The new calendar point out the advantage to celebrating Nativity separately from the secular observances of Christmas and New Year , which are associated with partying and alcohol consumption. Critics also point out that proponents of the new calendar tend to use worldly rather than spiritual justification for changing the calendar: wanting to "party with everyone else" at Christmas; concern that

16050-488: The new calendar, Kyrio-Pascha becomes an impossibility. The Apostles' Fast displays the most difficult aspect of the new calendar. The fast begins on the moveable cycle and ends on the fixed date of 29 June; since the new calendar is 13 days ahead of the traditional Julian calendar, the Apostles' Fast is 13 days shorter for those who follow the new calendar, and some years it is completely abrogated. Furthermore, critics of

16200-503: The next day will be 1 March 2900 in both calendars - hence the '0' notation. In 900 Julian years there are 900 ⁄ 4 = 225 leap days. The Revised Julian leap rule omits seven of nine century leap years, leaving 225−7 = 218 leap days per 900-year cycle. Thus the calendar mean year is 365 +  218 ⁄ 900 days, but this is actually a double-cycle that reduces to 365 +  109 ⁄ 450 = 365.24 2 days, or exactly 365 days 5 hours 48 minutes 48 seconds, which

16350-494: The observation of young stars embedded in molecular clouds and the cores of galaxies. Observations from the Wide-field Infrared Survey Explorer (WISE) have been particularly effective at unveiling numerous galactic protostars and their host star clusters . With the exception of infrared wavelengths close to visible light, such radiation is heavily absorbed by the atmosphere, or masked, as

16500-491: The other members of the original Orthodox Pentarchy (the Patriarchates of Jerusalem, Antioch, and Alexandria) or from the largest Orthodox church, the Russian Orthodox Church . The Serbian delegation presented a proposal by Maksim Trpković, which had a leap year rule in which century years would become common years, except those with remainders of 0 or 400 when divided by 900, which would remain leap years. However, it

16650-553: The particles produced when cosmic rays hit the Earth's atmosphere. Gravitational-wave astronomy is an emerging field of astronomy that employs gravitational-wave detectors to collect observational data about distant massive objects. A few observatories have been constructed, such as the Laser Interferometer Gravitational Observatory LIGO . LIGO made its first detection on 14 September 2015, observing gravitational waves from

16800-481: The patriarch as one involving the unity of the whole Church, particularly in the East. In turn, the affairs of the Constantinopolitan church were overseen not just by the patriarch, but also by synods held including visiting bishops. This pan-Orthodox synod came to be referred to as the ἐνδημοῦσα σύνοδος ( endemousa synodos , " resident synod "). The resident synod not only governed the business of

16950-493: The patriarch in determining the affairs of the possessions under his jurisdiction. The synod first developed from what was referred to as the resident synod , composed of the patriarch, local bishops, and any Orthodox bishops who were visiting in the imperial capital of Constantinople. After the fall of Constantinople , the synod's membership became limited to bishops of the patriarchate. The Holy and Sacred Synod, presided over by His All-Holiness Ecumenical Patriarch Bartholomew I,

17100-408: The patriarchate but also examined questions pertinent to the whole Church as well as the eastern half of the old empire. The patriarch thus came to have the title of Ecumenical , which referenced not a universal episcopacy over other bishops but rather the position of the patriarch as at the center of the oikoumeni , the "household" of the empire. As the Roman Empire stabilized and grew, so did

17250-517: The patriarchate but, from 1448, the Russian church came to function independently. Within decades after the Fall of Constantinople to Mehmed II of the Ottoman Empire on 29 May 1453, some were nominating Moscow as the "Third Rome" , or the "New Rome". In 1589, 141 years later, Constantinople came to recognize Russia's independence and led the Eastern Orthodox Church in declaring Russia also to be

17400-646: The period of the siege of Constantinople , the trapped worshippers of the city participated in the Divine Liturgy and the Prayer of the Hours at the Hagia Sophia and the church formed a safe-haven and a refuge for many of those who were unable to contribute to the city's defence, which comprised women, children, elderly, the sick and the wounded. Being trapped in the church, the many congregants and yet more refugees inside became spoils-of-war to be divided amongst

17550-497: The planet Uranus , the first new planet found. During the 18–19th centuries, the study of the three-body problem by Leonhard Euler , Alexis Claude Clairaut , and Jean le Rond d'Alembert led to more accurate predictions about the motions of the Moon and planets. This work was further refined by Joseph-Louis Lagrange and Pierre Simon Laplace , allowing the masses of the planets and moons to be estimated from their perturbations. Significant advances in astronomy came about with

17700-470: The planets with great accuracy, a field known as celestial mechanics . More recently the tracking of near-Earth objects will allow for predictions of close encounters or potential collisions of the Earth with those objects. The measurement of stellar parallax of nearby stars provides a fundamental baseline in the cosmic distance ladder that is used to measure the scale of the Universe. Parallax measurements of nearby stars provide an absolute baseline for

17850-576: The pope made no concessions and the former was sent with legatine powers to the imperial capital to solve the questions raised once and for all. Humbert, Frederick of Lorraine , and Peter, Archbishop of Amalfi , arrived in April 1054 and were met with a hostile reception; they stormed out of the palace, leaving the papal response with Michael, who in turn was even more angered by their actions. The patriarch refused to recognise their authority or, practically, their existence. When Pope Leo died on April 19, 1054,

18000-543: The pre-colonial Middle Ages, but modern discoveries show otherwise. For over six centuries (from the recovery of ancient learning during the late Middle Ages into the Enlightenment), the Roman Catholic Church gave more financial and social support to the study of astronomy than probably all other institutions. Among the Church's motives was finding the date for Easter . Medieval Europe housed

18150-536: The privilege given to Islam . requires by law that the Patriarch be a Turkish citizen by birth, which all Patriarchs have been since 1923 – all ethnic Greeks from the decreasing Greek minority of Turkey , which is causing a shortage of priests and consequently potential candidates for the post of Ecumenical Patriarch. The closing of the Orthodox Theological School of Halki

18300-432: The proleptic Revised Julian calendar was behind the proleptic Gregorian calendar . The Revised Julian calendar is the same as the Gregorian calendar from 1 March 1600 to 28 February 2800, but the following day would be 1 March 2800 (RJ) or 29 February 2800 (G); this difference is denoted as '+1' in the table. 2900 is a leap year in Revised Julian, but not Gregorian: 29 February 2900 (RJ) is the same as 28 February 2900 (G) and

18450-458: The properties examined include luminosity , density , temperature , and chemical composition. Because astrophysics is a very broad subject, astrophysicists typically apply many disciplines of physics, including mechanics , electromagnetism , statistical mechanics , thermodynamics , quantum mechanics , relativity , nuclear and particle physics , and atomic and molecular physics . In practice, modern astronomical research often involves

18600-473: The properties of more distant stars, as their properties can be compared. Measurements of the radial velocity and proper motion of stars allow astronomers to plot the movement of these systems through the Milky Way galaxy. Astrometric results are the basis used to calculate the distribution of speculated dark matter in the galaxy. During the 1990s, the measurement of the stellar wobble of nearby stars

18750-459: The question of whether extraterrestrial life exists, and how humans can detect it if it does. The term exobiology is similar. Astrobiology makes use of molecular biology , biophysics , biochemistry , chemistry , astronomy, physical cosmology , exoplanetology and geology to investigate the possibility of life on other worlds and help recognize biospheres that might be different from that on Earth. The origin and early evolution of life

18900-411: The rift between the churches. However, a number of factors and historical events worked to widen the separation over time. The Fourth Crusade in exchange for promised funds attempted to help the deposed emperor Alexius IV regain his throne. After taking Constantinople, returning Alexius IV to the throne, the revolt against and murder of Alexius IV left the Crusaders without payment. On 12 April 1204,

19050-425: The rotation of the Earth, furthermore, Buridan also developed the theory of impetus (predecessor of the modern scientific theory of inertia ) which was able to show planets were capable of motion without the intervention of angels. Georg von Peuerbach (1423–1461) and Regiomontanus (1436–1476) helped make astronomical progress instrumental to Copernicus's development of the heliocentric model decades later. During

19200-624: The sack of Constantinople by the Frankish and Venetian Crusaders of the Fourth Crusade: The Latin soldiery subjected the greatest city in Europe to an indescribable sack. For three days they murdered, raped, looted and destroyed on a scale which even the ancient Vandals and Goths would have found unbelievable. Constantinople had become a veritable museum of ancient and Byzantine art, an emporium of such incredible wealth that

19350-593: The seat for the Ecumenical Patriarch, who enjoys the status of primus inter pares (first among equals) among the world's Eastern Orthodox prelates and is regarded as the representative and spiritual leader of Eastern Orthodox Christians. The Ecumenical Patriarchate promotes the expansion of the Christian faith and Eastern Orthodox doctrine , and the Ecumenical Patriarchs are involved in ecumenism and interfaith dialogue , charitable work, and

19500-590: The solar declination crosses the celestial equator northward, and then it outputs that data as the Terrestrial Time day and fraction of day relative to 1 January 2000 at noon ( J2000.0 epoch). The progressive tidal slowing of the Earth rotation rate was accounted for by subtracting Δ T as calculated by the Espenak - Meeus polynomial set recommended at the NASA Eclipses web site to obtain

19650-548: The southern hemisphere with little issue centuries before the introduction of the new calendar. From a spiritual perspective, Old Calendarists also point to a number of miraculous occurrences that occur on the old calendar exclusively, such as the "descent of the cloud on the mount" on the feast of the Transfiguration. After the calendar change was instituted, the followers of the old calendar in Greece apparently witnessed

19800-633: The spiritual, administrative, fiscal, cultural and legal jurisdiction of the Patriarchate. Some of the other patriarchs came at various points to live permanently in Constantinople and function as part of the local church government. This situation, according to some of the Orientalists and historians, shows the Pax Ottomana (or Pax Ottomanica , literally "the Ottoman Peace"). The Russian Orthodox Church , which for centuries had been

19950-400: The springtime. This would conflict with the Church's historic practice of celebrating Christ's birth on 25 December , a date chosen for a number of reasons. One of the reasons mentioned by Bennet is the time of the winter solstice , when the days begin to lengthen again as the physical sun makes its reappearance, along with the fact that Christ has traditionally been recognized by Christians as

20100-436: The stars" depending on the translation). Astronomy should not be confused with astrology , the belief system which claims that human affairs are correlated with the positions of celestial objects. Although the two fields share a common origin, they are now entirely distinct. "Astronomy" and " astrophysics " are synonyms. Based on strict dictionary definitions, "astronomy" refers to "the study of objects and matter outside

20250-477: The subject, whereas "astrophysics" is used to describe the physics-oriented version of the subject. However, since most modern astronomical research deals with subjects related to physics, modern astronomy could actually be called astrophysics. Some fields, such as astrometry , are purely astronomy rather than also astrophysics. Various departments in which scientists carry out research on this subject may use "astronomy" and "astrophysics", partly depending on whether

20400-539: The support of the Soviet government while Patriarch Tikhon was under house arrest. After his release, on 15 July 1923 , he declared that all Renovationist decrees were without grace. On 15 October 1923, Patriarch Tikhon accepted the new calendar, but it caused disagreement among clergy, and 24 days later he reverted the decision. The present Russian Orthodox Church continues to use the Julian calendar for both its fixed festivals and for Easter. The basic justification for

20550-410: The total amount looted from Constantinople was about 900,000 silver marks. The Venetians received 150,000 silver marks that was their due, while the Crusaders received 50,000 silver marks. A further 100,000 silver marks were divided evenly up between the Crusaders and Venetians. The remaining 500,000 silver marks were secretly kept back by many Crusader knights. Nicetas Choniates gives a vivid account of

20700-436: The triumphant invaders. The building was desecrated and looted, with the helpless occupants who sought shelter within the church being enslaved. While most of the elderly and the infirm/wounded and sick were killed, and the remainder (mainly teenage males and young boys) were chained up and sold into slavery. The women of Constantinople also suffered from rape at the hands of Ottoman forces. According to Barbaro, "all through

20850-619: The universe consists of a multitude of galaxies. With this Hubble formulated the Hubble constant , which allowed for the first time a calculation of the age of the Universe and size of the Observable Universe, which became increasingly precise with better meassurements, starting at 2 billion years and 280 million light-years, until 2006 when data of the Hubble Space Telescope allowed a very accurate calculation of

21000-409: The universe; origin of cosmic rays ; general relativity and physical cosmology , including string cosmology and astroparticle physics . Astrochemistry is the study of the abundance and reactions of molecules in the Universe , and their interaction with radiation . The discipline is an overlap of astronomy and chemistry . The word "astrochemistry" may be applied to both the Solar System and

21150-479: The use of the Julian calendar was implicit in the decision of the First Ecumenical Council at Nicaea (325), which standardized the calculation of the date of Easter , no authority less than an Ecumenical Council may change it. It is further argued that the adoption of the new calendar in some countries and not in others has broken the liturgical unity of the Eastern Orthodox churches, undoing

21300-440: The world's Orthodox Christians, citing that it represents the numerically largest Orthodox community. As a ruling institution, the Ottoman Empire brought regulations on how the cities would be built (quality reassurances) and how the architecture (structural integrity, social needs, etc.) should be shaped. Special restrictions were imposed concerning the construction, renovation, size and usage of bells in churches. For example, in

21450-640: Was used to detect large extrasolar planets orbiting those stars. Theoretical astronomers use several tools including analytical models and computational numerical simulations ; each has its particular advantages. Analytical models of a process are better for giving broader insight into the heart of what is going on. Numerical models reveal the existence of phenomena and effects otherwise unobserved. Theorists in astronomy endeavor to create theoretical models that are based on existing observations and known physics, and to predict observational consequences of those models. The observation of phenomena predicted by

21600-467: Was an early analog computer designed to calculate the location of the Sun , Moon , and planets for a given date. Technological artifacts of similar complexity did not reappear until the 14th century, when mechanical astronomical clocks appeared in Europe. Astronomy flourished in the Islamic world and other parts of the world. This led to the emergence of the first astronomical observatories in

21750-536: Was formulated, heavily evidenced by cosmic microwave background radiation , Hubble's law , and the cosmological abundances of elements . Space telescopes have enabled measurements in parts of the electromagnetic spectrum normally blocked or blurred by the atmosphere. In February 2016, it was revealed that the LIGO project had detected evidence of gravitational waves in the previous September. The main source of information about celestial bodies and other objects

21900-576: Was named autocephalous by the local secular government but Constantinople refused recognition until 1879. In 1860 the Bulgarians de facto seceded from the Ecumenical Patriarchate; in 1870 the Bulgarian church was politically recognized as autonomous under the name Bulgarian Exarchate by the Sultan's firman, but it was not until 1945 that it was recognized by the Ecumenical Patriarchate. In 1922,

22050-574: Was no explicit indication that the entire Western church was being anathematised. In the bull of excommunication issued against Patriarch Michael I Cerularius by the papal legates, one of the reasons cited was the alleged deletion by the Eastern Church of the "Filioque" from the original Nicene Creed. In fact, it was precisely the opposite: the Eastern Church had not deleted anything; it was the Western Church that had added this phrase to

22200-686: Was overrun by the Ottoman Turks in 1453, the Patriarchate came to care more directly for all the Orthodox living in the Ottoman Empire . Mehmed II appointed Gennadios II Scholarios as the Patriarch in 1454 and designated him as the spiritual leader as well as the ethnarch or, in Turkish, milletbashi of all the Orthodox Christians in the Empire, regardless of ethnic origin; not only Greeks, but also Bulgarians , Serbs , Albanians , Wallachians , Moldavians , Croatis , Syrians , orthodox Arabs , Georgians and Lazs came under

22350-452: Was preferred over the Gregorian because its mean year was within two seconds of the then current length of the mean tropical year . The present vernal equinox year, however, is about 12 seconds longer, in terms of mean solar days. The synod also proposed the adoption of an astronomical rule for Easter : Easter was to be the Sunday after the midnight-to-midnight day at the meridian of

22500-414: Was rejected because the proposal would omit a leap year in 2000, which would cause it to differ from the Gregorian after only 77 years. Milanković proposed a small modification of Trpkovic's proposal, changing the timing of the century leap years to those with remainder 200 or 600 when divided by 900 in order to maximise the amount of time before it would differ from the Gregorian. Milanković's arguments won

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