Misplaced Pages

#685314

117-644: Rapid changes in the strategic environment due to the rapid dissolution of the Soviet Union led, in 1993, to Bill Clinton focusing on theater ballistic missiles and similar threats, and renaming it the Ballistic Missile Defense Organization , BMDO. With another change to a more global focus made by George W. Bush , in 2002 the organization became the Missile Defense Agency. The Missile Defense Agency

234-414: A countermeasure to hypersonic boost-glide weapons, by using existing data on the adversary hypersonic systems which were gathered from existing US satellite and ground-based sensors. MDA then fed this data into its existing systems models, and concluded that the adversary hypersonic weapon's glide phase offered the best chance for MDA to intercept it. MDA next proffered a request for information (RFI) from

351-469: A planetary body about its primary body . The line of apsides (also called apse line, or major axis of the orbit) is the line connecting the two extreme values . Apsides pertaining to orbits around the Sun have distinct names to differentiate themselves from other apsides; these names are aphelion for the farthest and perihelion for the nearest point in the solar orbit. The Moon 's two apsides are

468-408: A Greek root) were used by physicist and science-fiction author Geoffrey A. Landis in a story published in 1998, thus appearing before perinigricon and aponigricon (from Latin) in the scientific literature in 2002. The suffixes shown below may be added to prefixes peri- or apo- to form unique names of apsides for the orbiting bodies of the indicated host/ (primary) system. However, only for

585-611: A Russian nationalist group, held an unsanctioned demonstration in Moscow. The authorities did not break up the demonstration and even kept traffic out of the demonstrators' way while they marched to an impromptu meeting with Boris Yeltsin. On 25 July 1987, 300 Crimean Tatars staged a noisy demonstration near the Kremlin Wall for several hours, calling for the right to return to their homeland, from which they were deported in 1944; police and soldiers looked on. On 23 August 1987,

702-542: A choice between multiple candidates, elected by secret ballot. However, the party delegates at the Plenum watered down Gorbachev's proposal, and democratic choice within the Communist Party was never significantly implemented. Gorbachev also radically expanded the scope of glasnost and stated that no subject was off limits for open discussion in the media. On 7 February, dozens of political prisoners were freed in

819-437: A different phase of the threat ballistic missile flight regime. Each phase offers different advantages and disadvantages to a missile defense system (see missile defense classified by trajectory phase ), and the geography of each defended area dictates the types of systems which can be employed. The resultant flexible and layered defense approach concept is believed to improve overall defense effectiveness. The more opportunities

936-490: A different epoch will generate differences. The time-of-perihelion-passage as one of six osculating elements is not an exact prediction (other than for a generic two-body model ) of the actual minimum distance to the Sun using the full dynamical model . Precise predictions of perihelion passage require numerical integration . The two images below show the orbits, orbital nodes , and positions of perihelion (q) and aphelion (Q) for

1053-869: A new central legislature, the Congress of People's Deputies (although the ban on other political parties was not lifted until 1990). On 1 July 1985, Gorbachev sidelined his main rival by removing Grigory Romanov from the Politburo and brought Boris Yeltsin into the Central Committee Secretariat . On 23 December 1985, Gorbachev appointed Yeltsin First Secretary of the Moscow Communist Party , replacing Viktor Grishin . Gorbachev continued to press for greater liberalization . On 23 December 1986 Andrei Sakharov ,

1170-741: A new organization called the Popular Front of Azerbaijan , loosely based on the Estonian Popular Front . On 17 September, when gun battles broke out between the Armenians and Azerbaijanis near Stepanakert , two soldiers were killed and more than two dozen injured. This led to almost tit-for-tat ethnic polarization in Nagorno-Karabakh's two main towns: the Azerbaijani minority was expelled from Stepanakert , and

1287-495: A new supreme legislative body called the Congress of People's Deputies . Frustrated by the old guard's resistance, Gorbachev embarked on a set of constitutional changes to attempt separation of party and state, thereby isolating his Party opponents. Detailed proposals for the new Congress of People's Deputies were published on 2 October 1988, and to enable the creation of the new legislature. The Supreme Soviet, during its 29 November – 1 December 1988, session, implemented amendments to

SECTION 10

#1732765273686

1404-511: A public meeting lacking official permission at Ivan Franko State University . On 13 November 1988, approximately 10,000 people attended an officially sanctioned meeting organized by the cultural heritage organization Spadschyna , the Kyiv University student club Hromada , and the environmental groups Zelenyi Svit ("Green World") and Noosfera , to focus on ecological issues. From 14 to 18 November, 15 Ukrainian activists were among

1521-486: A revised delegate list. Authorities attempted to disperse the rally in front of Druzhba Stadium. On 7 July, 10,000 to 20,000 people witnessed the launch of the Democratic Front to Promote Perestroika. On 17 July, a group of 10,000 gathered in the village Zarvanytsia for Millennium services celebrated by Ukrainian Greek-Catholic Bishop Pavlo Vasylyk. The militia tried to disperse attendees, but it turned out to be

1638-564: A seat on the Supreme Soviet, and in the summer he formed the first opposition, the Inter-Regional Deputies Group , composed of Russian nationalists and liberals . Composing the final legislative group in the Soviet Union, those elected in 1989 played a vital part in reforms and the eventual breakup of the Soviet Union during the next two years. On 30 May 1989, Gorbachev proposed that local elections across

1755-590: A system has to neutralize a threat (e.g., by shooting down a missile), the better the chance of success. Activities have also been categorized as fulfilling the goals of one of five "blocks". For example, "block 4.0" was stated as "Defend Allies and Deployed Forces in Europe from Limited Iranian Long-Range Threats and Expand Protection of U.S. Homeland". It included the US missile defense complex in Poland to be constructed, and

1872-476: A thousand police to stop the march, with the resulting clashes leaving two Azerbaijanis dead. These deaths, announced on state radio, led to the Sumgait Pogrom . Between 26 February and 1 March, the city of Sumgait (Azerbaijan) saw violent anti-Armenian rioting during which at least 32 people were killed. The authorities totally lost control and occupied the city with paratroopers and tanks; nearly all of

1989-467: A time relative to seasons, since this determines the contribution of the elliptical orbit to seasonal variations. The variation of the seasons is primarily controlled by the annual cycle of the elevation angle of the Sun, which is a result of the tilt of the axis of the Earth measured from the plane of the ecliptic . The Earth's eccentricity and other orbital elements are not constant, but vary slowly due to

2106-696: A violent protest action in the capital on 28 October, many of Songalia's remaining holdovers within the CPL either resigned or retired in protest of the police brutality of that day. On 20 February 1988, after a week of growing demonstrations in Stepanakert , capital of the Nagorno-Karabakh Autonomous Oblast (the ethnically Armenian-majority area within the Azerbaijan Soviet Socialist Republic ),

2223-458: A year - with the relatively liberal Algirdas Mykolas Brazauskas . In October 1988, Brazauskas bowed to pressure from Sąjūdis members, and legalized the flying of the historic yellow-green-red flag of independent Lithuania, and in November 1988 he passed a law making Lithuanian the country's official language; also, the former national anthem, " Tautiška giesmė ", was later reinstated. Following

2340-435: Is 236 years early, less accurately shows Eris coming to perihelion in 2260. 4 Vesta came to perihelion on 26 December 2021, but using a two-body solution at an epoch of July 2021 less accurately shows Vesta came to perihelion on 25 December 2021. Trans-Neptunian objects discovered when 80+ AU from the Sun need dozens of observations over multiple years to well constrain their orbits because they move very slowly against

2457-512: Is created from the prefixes ap- , apo- (from ἀπ(ό) , (ap(o)-)  'away from') for the farthest or peri- (from περί (peri-)  'near') for the closest point to the primary body , with a suffix that describes the primary body. The suffix for Earth is -gee , so the apsides' names are apogee and perigee . For the Sun, the suffix is -helion , so the names are aphelion and perihelion . According to Newton's laws of motion , all periodic orbits are ellipses. The barycenter of

SECTION 20

#1732765273686

2574-399: Is lowest. Despite this, summers in the northern hemisphere are on average 2.3 °C (4 °F) warmer than in the southern hemisphere, because the northern hemisphere contains larger land masses, which are easier to heat than the seas. Perihelion and aphelion do however have an indirect effect on the seasons: because Earth's orbital speed is minimum at aphelion and maximum at perihelion,

2691-708: Is partially or wholly responsible for the development of several ballistic missile defense (BMD) systems, including the Patriot PAC-3 , Aegis BMD , THAAD and the Ground-Based Midcourse Defense system with a cost of $ 246 billion. They also led the development of numerous other projects, including the Multiple Kill Vehicle and the newer Multi-Object Kill Vehicle, the Kinetic Energy Interceptor and

2808-495: The "line of nodes" where a planet's tilted orbit intersects the plane of reference; here they may be 'seen' as the points where the blue section of an orbit meets the pink. The chart shows the extreme range—from the closest approach (perihelion) to farthest point (aphelion)—of several orbiting celestial bodies of the Solar System : the planets, the known dwarf planets, including Ceres , and Halley's Comet . The length of

2925-402: The 1977 Soviet Constitution , enacted a law on electoral reform, and set the date of the election for 26 March 1989. On 29 November 1988, the Soviet Union ceased jamming all foreign radio stations, allowing Soviet citizens – for the first time since a brief period in the 1960s – to have unrestricted access to news sources beyond Communist Party control. In 1986 and 1987, Latvia had been in

3042-573: The Airborne Laser . As the inheritor of the SDI and BMDO work, the MDA continues to fund fundamental research in high-energy physics, supercomputing/computation, advanced materials, and many other science and engineering disciplines. The MDA currently publishes the following mission statement: "The Missile Defense Agency's (MDA) mission is to develop and deploy a layered Missile Defense System to defend

3159-511: The Congress of People's Deputies of the Soviet Union lasted until 24 January 1989. For the next month, selection among the 7,531 district nominees took place at meetings organized by constituency-level electoral commissions. On 7 March, a final list of 5,074 candidates was published; about 85% were Party members. In the two weeks prior to the 1,500 district polls, elections to fill 750 reserved seats of public organizations, contested by 880 candidates, were held. Of these seats, 100 were allocated to

3276-759: The European Mid-course Radar (EMR), currently located at the Ronald Reagan Ballistic Missile Defense Test Site at Kwajalein Atoll , which was to have been modified and relocated to the Czech Republic . On 17 September 2009, the Obama administration scrapped the "block 4.0" plan, in favor of a new so-called "European Phased Adaptive Approach" (EPAA). Can intercept all ranges of missiles, but

3393-683: The Freedom Monument , shouting, "Soviet Russia out! Free Latvia!" Security forces confronted the marchers, and several police vehicles were overturned. The Jeltoqsan ('December') of 1986 were riots in Alma-Ata , Kazakhstan , sparked by Gorbachev's dismissal of Dinmukhamed Kunaev , the First Secretary of the Communist Party of Kazakhstan and an ethnic Kazakh , who was replaced with Gennady Kolbin , an outsider from

3510-729: The Hungarian Revolution of 1956 and the Prague Spring in 1968. Gorbachev abandoned the oppressive and expensive Brezhnev Doctrine , which mandated intervention in the Warsaw Pact states, in favor of non-intervention in the internal affairs of allies – jokingly termed the Sinatra Doctrine in a reference to the Frank Sinatra song " My Way ". Poland was the first republic to democratize following

3627-605: The NKVD performed secret killings in Kurapaty. Initially the Front had significant visibility because its numerous public actions almost always ended in clashes with the police and the KGB . Spring 1989 saw the people of the Soviet Union exercising a democratic choice, albeit limited, for the first time since 1917, when they elected the new Congress of People's Deputies. Just as important

Missile Defense Agency - Misplaced Pages Continue

3744-702: The Politburo on 11 March 1985, just over four hours after his predecessor Konstantin Chernenko died at the age of 73. Gorbachev, aged 54, was the youngest member of the Politburo. His initial goal as general secretary was to revive the stagnating Soviet economy , and he realized that doing so would require reforming underlying political and social structures. The reforms began with personnel changes of senior Brezhnev-era officials who would impede political and economic change. On 23 April 1985, Gorbachev brought two protégés, Yegor Ligachev and Nikolai Ryzhkov , into

3861-670: The Romanian language and return to the Latin alphabet. The transition from "movement" (an informal association) to "front" (a formal association) was seen as a natural "upgrade" once a movement gained momentum with the public, and the Soviet authorities no longer dared to crack down on it. On 26 April 1988, about 500 people participated in a march organized by the Ukrainian Cultural Club on Kyiv's Khreschatyk Street to mark

3978-557: The Russian SFSR . Demonstrations started in the morning of 17 December 1986, with 200 to 300 students in front of the Central Committee building on Brezhnev Square . On the next day, 18 December, protests turned into civil unrest as clashes between troops, volunteers, militia units, and Kazakh students turned into a wide-scale confrontation. The clashes could only be controlled on the third day. On 6 May 1987, Pamyat ,

4095-651: The Spitak earthquake struck, killing an estimated 25,000 to 50,000 people. When Gorbachev rushed back from a visit to the United States, he was so angered with being confronted by protesters calling for Nagorno-Karabakh to be made part of the Armenian Republic during a natural disaster that on 11 December 1988, he ordered that the entire Karabakh Committee be arrested. In Tbilisi , the capital of Soviet Georgia , many demonstrators camped out in front of

4212-558: The Theater Square , by 22 February, there were 100,000, the next day 300,000, and a transport strike was declared, by 25 February, there were close to a million demonstrators—more than a quarter of Armenia's population. This was the first of the large, peaceful public demonstrations that would become a feature of communism's overthrow in Prague, Berlin, and, ultimately, Moscow. Leading Armenian intellectuals and nationalists, including

4329-402: The inner planets, situated outward from the Sun as Mercury, Venus, Earth, and Mars. The reference Earth-orbit is colored yellow and represents the orbital plane of reference . At the time of vernal equinox, the Earth is at the bottom of the figure. The second image (below-right) shows the outer planets, being Jupiter, Saturn, Uranus, and Neptune. The orbital nodes are the two end points of

4446-818: The nuclear launch codes —to Yeltsin, who was now the first president of the Russian Federation . That evening, the Soviet flag was lowered from the Kremlin for the last time and replaced with the Russian tricolor flag . The following day, the Supreme Soviet of the Soviet Union's upper chamber, the Soviet of the Republics, formally dissolved the Union. The events of the dissolution resulted in its 15 constituent republics gaining full independence which also marked

4563-428: The precession of the axes .) The dates and times of the perihelions and aphelions for several past and future years are listed in the following table: The following table shows the distances of the planets and dwarf planets from the Sun at their perihelion and aphelion. These formulae characterize the pericenter and apocenter of an orbit: While, in accordance with Kepler's laws of planetary motion (based on

4680-482: The revolutions of 1989 in which Soviet-imposed socialist regimes of the Warsaw Pact were toppled peacefully ( with the notable exception of Romania ), which in turn increased pressure on Gorbachev to introduce greater democracy and autonomy for the Soviet Union's constituent republics. Under Gorbachev's leadership, the Communist Party of the Soviet Union (CPSU) in 1989 introduced limited competitive elections to

4797-598: The 100 human-, national- and religious-rights advocates invited to discuss human rights with Soviet officials and a visiting delegation of the U.S. Commission on Security and Cooperation in Europe (also known as the Helsinki Commission). On 10 December, hundreds gathered in Kyiv to observe International Human Rights Day at a rally organized by the Democratic Union. The unauthorized gathering resulted in

Missile Defense Agency - Misplaced Pages Continue

4914-605: The 14,000 Armenian residents of Sumgait fled. Gorbachev refused to make any changes to the status of Nagorno-Karabakh, which remained part of Azerbaijan. He instead sacked the Communist Party Leaders in both Republics in response – on 21 May 1988, Kamran Baghirov was replaced by Abdulrahman Vezirov as First Secretary of the Azerbaijan Communist Party . From 23 July to September 1988, a group of Azerbaijani intellectuals began working for

5031-423: The 2,250 CPD seats were filled. In district races, run-off elections were held in 76 constituencies on 2 and 9 April and fresh elections were organized on 14 and 20 April to 23 May, in the 199 remaining constituencies where the required absolute majority was not attained. While most CPSU-endorsed candidates were elected, more than 300 lost to independent candidates such as Yeltsin, the physicist Andrei Sakharov and

5148-514: The 48th anniversary of the secret protocols of the 1939 Molotov Pact , thousands of demonstrators marked the occasion in the three Baltic capitals to sing independence songs and attend speeches commemorating Stalin's victims. The gatherings were sharply denounced in the official press and closely watched by the police but were not interrupted. On 14 June 1987, about 5,000 people gathered again at Freedom Monument in Riga , and laid flowers to commemorate

5265-611: The 542-member Supreme Soviet passed the measure 254–85 (with 36 abstentions). The decision required a constitutional amendment, ratified by the full congress, which met 12–25 December. It also passed measures that would allow direct elections for presidents of each of the 15 constituent republics. Gorbachev strongly opposed such a move during debate but was defeated. The vote expanded the power of republics in local elections, enabling them to decide for themselves how to organize voting. Latvia, Lithuania, and Estonia had already proposed laws for direct presidential elections. Local elections in all

5382-559: The Armenian minority was expelled from Shusha . On 17 November 1988, in response to the exodus of tens of thousands of Azerbaijanis from Armenia, a series of mass demonstrations began in Baku 's Lenin Square, lasting 18 days and attracting half a million demonstrators in support of their compatriots in that region. On 5 December 1988, the Soviet police and civilian militiamen moved in, cleared

5499-846: The CPSU, 100 to the All-Union Central Council of Trade Unions , 75 to the Communist Youth Union ( Komsomol ), 75 to the Committee of Soviet Women, 75 to the War and Labour Veterans' Organization, and 325 to other organizations such as the Academy of Sciences . The selection process was done in April. In the 26 March general elections, voter participation was an impressive 89.8%, and 1,958 (including 1,225 district seats) of

5616-461: The Earth reaches aphelion currently in early July, approximately 14 days after the June solstice . The aphelion distance between the Earth's and Sun's centers is currently about 1.016 71  AU or 152,097,700 km (94,509,100 mi). The dates of perihelion and aphelion change over time due to precession and other orbital factors, which follow cyclical patterns known as Milankovitch cycles . In

5733-401: The Earth, Moon and Sun systems are the unique suffixes commonly used. Exoplanet studies commonly use -astron , but typically, for other host systems the generic suffix, -apsis , is used instead. The perihelion (q) and aphelion (Q) are the nearest and farthest points respectively of a body's direct orbit around the Sun . Comparing osculating elements at a specific epoch to those at

5850-538: The Earth, Sun, stars, and the Galactic Center respectively. The suffix -jove is occasionally used for Jupiter, but -saturnium has very rarely been used in the last 50 years for Saturn. The -gee form is also used as a generic closest-approach-to "any planet" term—instead of applying it only to Earth. During the Apollo program , the terms pericynthion and apocynthion were used when referring to orbiting

5967-676: The Estonian Popular Front and legalized the flying of the old blue-black-white flag of Estonia, and agreed to a new state language law that made Estonian the official language of the Republic. On 2 October, the Popular Front formally launched its political platform at a two-day congress. Väljas attended, gambling that the Front could help Estonia become a model of economic and political revival, while moderating separatist and other radical tendencies. On 16 November 1988,

SECTION 50

#1732765273686

6084-439: The Latvian Popular Front and legalized flying the former carmine red-and-white flag of independent Latvia, and on 6 October he passed a law making Latvian the country's official language. The Popular Front of Lithuania, called Sąjūdis ("Movement"), was founded in May 1988. On 19 October 1988, Gorbachev replaced Ringaudas Songaila , the "old guard" leader of the Communist Party of Lithuania - who had been in office for nearly

6201-443: The Moon ; they reference Cynthia, an alternative name for the Greek Moon goddess Artemis . More recently, during the Artemis program , the terms perilune and apolune have been used. Regarding black holes, the term peribothron was first used in a 1976 paper by J. Frank and M. J. Rees, who credit W. R. Stoeger for suggesting creating a term using the greek word for pit: "bothron". The terms perimelasma and apomelasma (from

6318-405: The Pact began to dissolve itself. The last of the countries to overthrow Communist leadership, Romania , only did so following the violent Romanian Revolution . Apogee An apsis (from Ancient Greek ἁψίς ( hapsís )  'arch, vault'; pl.   apsides / ˈ æ p s ɪ ˌ d iː z / AP -sih-deez ) is the farthest or nearest point in the orbit of

6435-445: The Politburo as full members. He kept the "power" ministries favorable by promoting KGB Chief Viktor Chebrikov from candidate to full member and appointing Minister of Defence Marshal Sergei Sokolov as a Politburo candidate. The freedom of speech brought by Gorbachev's reforms allowed nationalist movements and ethnic disputes within the Soviet Union to be expressed and grow into dominant political movements. It also led indirectly to

6552-712: The Regional Soviet voted to secede and join with the Soviet Socialist Republic of Armenia . This local vote in a small, remote part of the Soviet Union made headlines around the world; it was an unprecedented defiance of republican and national authorities. On 22 February 1988, in what became known as the " Askeran clash ", thousands of Azerbaijanis marched towards Nagorno-Karabakh, demanding information about rumors of an Azerbaijani having been killed in Stepanakert. They were informed that no such incident had occurred, but refused to believe it. Dissatisfied with what they were told, thousands began marching toward Nagorno-Karabakh, killing (or injuring?) 50. Karabakh authorities mobilised over

6669-451: The Soviet Union by the Act of 11 March 1990 with its Baltic neighbors and the Southern Caucasus republic of Georgia joining it over the next two months. During the failed 1991 August coup , communist hardliners and military elites attempted to overthrow Gorbachev and stop the failing reforms. However, the turmoil led to the central government in Moscow losing influence, ultimately resulting in many republics proclaiming independence in

6786-434: The Soviet Union's federal government and General Secretary (also President ) Mikhail Gorbachev 's effort to reform the Soviet political and economic system in an attempt to stop a period of political stalemate and economic backslide . The Soviet Union had experienced internal stagnation and ethnic separatism. Although highly centralized until its final years, the country was made up of 15 top-level republics that served as

6903-594: The Soviet Union, which were variously suppressed or tolerated. The CTAG ( Latvian : Cilvēktiesību aizstāvības grupa , lit.   'Human Rights Defense Group') Helsinki-86 was founded in July 1986 in the Latvian port town of Liepāja . Helsinki-86 was the first openly anti-Communist organization in the U.S.S.R., and the first openly organized opposition to the Soviet regime, setting an example for other ethnic minorities' pro-independence movements. On 26 December 1986, 300 Latvian youths gathered in Riga's Cathedral Square and marched down Lenin Avenue toward

7020-408: The Sun is 0.7 million km, and the radius of Jupiter (the largest planet) is 0.07 million km, both too small to resolve on this image. Currently, the Earth reaches perihelion in early January, approximately 14 days after the December solstice . At perihelion, the Earth's center is about 0.983 29 astronomical units (AU) or 147,098,070 km (91,402,500 mi) from the Sun's center. In contrast,

7137-425: The Supreme Soviet of the Estonian SSR adopted a declaration of national sovereignty under which Estonian laws would take precedence over those of the Soviet Union. Estonia's parliament also laid claim to the republic's natural resources including land, inland waters, forests, mineral deposits, and to the means of industrial production, agriculture, construction, state banks, transportation, and municipal services within

SECTION 60

#1732765273686

7254-403: The Ukrainian Cultural Club hosted its own observances in Kyiv at the monument to St. Volodymyr the Great , the grand prince of Kyivan Rus . On 16 June 1988, 6,000 to 8,000 people gathered in Lviv to hear speakers declare no confidence in the local list of delegates to the 19th Communist Party conference, to begin on 29 June. On 21 June, a rally in Lviv attracted 50,000 people who had heard about

7371-424: The United States, its deployed forces, allies, and friends from missile attacks in all phases of flight." The National Defense Authorization Act is cited as the original source of the MDA's mission: "It is the policy of the United States to maintain and improve an effective, robust layered missile defense system capable of defending the territory of the United States, allies, deployed forces, and capabilities against

7488-425: The actual closest approach between the Sun's and the Earth's centers (which in turn defines the timing of perihelion in a given year). Because of the increased distance at aphelion, only 93.55% of the radiation from the Sun falls on a given area of Earth's surface as does at perihelion, but this does not account for the seasons , which result instead from the tilt of Earth's axis of 23.4° away from perpendicular to

7605-414: The adjacent park harboring Aleea Clasicilor (The " Alley of Classics [of Literature]"). On 15 January 1988, in a tribute to Mihai Eminescu at his bust on the Aleea Clasicilor, Anatol Șalaru submitted a proposal to continue the meetings. In the public discourse, the movement called for national awakening, freedom of speech, the revival of Moldovan traditions, and for the attainment of official status for

7722-505: The anniversary of Stalin 's mass deportation of Latvians in 1941. The authorities did not crack down on demonstrators, which encouraged more and larger demonstrations throughout the Baltic States. On 18 November 1987, hundreds of police and civilian militiamen cordoned off the central square to prevent any demonstration at Freedom Monument, but thousands lined the streets of Riga in silent protest regardless. On 17 October 1987, about 3,000 Armenians demonstrated in Yerevan complaining about

7839-423: The atmosphere. Ground-based missile defense systems can defend from long-range and intermediate-range ballistic missiles in this phase. Mobile elements can defend against medium and short ranged missiles in midcourse. This phase is the last chance to intercept the warhead. This contains the least-desirable Interception Point (IP) because there is little room for error and the interception will probably occur close to

7956-463: The beginning of Yeltsin's rebranding as a rebel and rise in popularity as an anti-establishment figure. The following four years of political struggle between Yeltsin and Gorbachev played a large role in the dissolution of the Soviet Union. On 11 November, Yeltsin was fired from the post of First Secretary of the Moscow Communist Party . In the years leading up to the dissolution, various protests and resistance movements occurred or took hold throughout

8073-471: The condition of Lake Sevan , the Nairit chemicals plant, and the Metsamor Nuclear Power Plant , and air pollution in Yerevan. Police tried to prevent the protest but took no action to stop it once the march was underway. The following day 1,000 Armenians participated in another demonstration calling for Armenian national rights in Karabakh and the proposed unification of both Nakhchivan and Nagorno-Karabakh to Armenia. The police tried to physically prevent

8190-422: The conservation of angular momentum ) and the conservation of energy, these two quantities are constant for a given orbit: where: Note that for conversion from heights above the surface to distances between an orbit and its primary, the radius of the central body has to be added, and conversely. The arithmetic mean of the two limiting distances is the length of the semi-major axis a . The geometric mean of

8307-576: The country, scheduled for November 1989, be postponed until early 1990 because there were still no laws governing the conduct of such elections. This was seen by some as a concession to local Party officials, who feared they would be swept from power in a wave of anti-establishment sentiment. On 25 October 1989, the Supreme Soviet voted to eliminate special seats for the Communist Party and other official organizations in union-level and republic-level elections, responding to sharp popular criticism that such reserved slots were undemocratic. After vigorous debate,

8424-438: The defended target. Research and development: One can distinguish disabling the warheads and just disabling the boosting capability. The latter has the risk of "shortfall": damage in countries between the launch site and the target location. See also APS report . Research and development: In use: Research and development: Research and development: By 2021, the Missile Defense Agency (MDA) realized that it almost had

8541-612: The defense community for building interceptors (denoted the GPI —glide phase interceptor) against the glide phase of that hypersonic weapon. GPIs would be guided by Hypersonic and Ballistic Tracking Space Sensors (HBTSS). These GPI interceptors could first be offered to the Navy for Aegis to intercept using the C2BMC , and later to the Army for THAAD to intercept using IBCS . By 2024, a first test of

8658-695: The detention of local activists. The Belarusian Popular Front was established in 1988 as a political party and cultural movement for democracy and independence, similar to the Baltic republics' popular fronts. The discovery of mass graves in Kurapaty outside Minsk by historian Zianon Pazniak , the Belarusian Popular Front's first leader, gave additional momentum to the pro-democracy and pro-independence movement in Belarus. It claimed that

8775-430: The developing and increasingly complex ballistic missile threat with funding subject to the annual authorization of appropriations and the annual appropriation of funds for National Missile Defense. National Defense Authorization Act (Public Law 114–328)" Ballistic Missile Defense Systems (BMDS) must be capable of operating in different regions of the world to ensure the success of the MDA mission. The International Strategy

8892-526: The distance measured between the barycenter of the 2-body system and the center of mass of the orbiting body. However, in the case of a spacecraft , the terms are commonly used to refer to the orbital altitude of the spacecraft above the surface of the central body (assuming a constant, standard reference radius). The words "pericenter" and "apocenter" are often seen, although periapsis/apoapsis are preferred in technical usage. The words perihelion and aphelion were coined by Johannes Kepler to describe

9009-703: The enactment of the April Novelization , as agreed upon following the Polish Round Table Agreement talks from February to April between the government and the Solidarity trade union. The Polish Solidarity Union, as established through the 1980 August Accords, presented Lech Wałęsa as their candidate, who became the first democratically elected president of Poland. The elections in Poland inspired other Eastern European Soviet Nations to pursue peaceful democratic transitions, and soon

9126-607: The end of 1989, the year the Berlin Wall fell. This was also the year that CNN became the first non-Soviet broadcaster allowed to beam its TV news programs to Moscow. Officially, CNN was available only to foreign guests in the Savoy Hotel , but Muscovites quickly learned how to pick up signals on their home televisions. That had a major effect on how Soviets saw events in their country and made censorship almost impossible. The month-long nomination period for candidates for

9243-475: The farthest point, apogee , and the nearest point, perigee , of its orbit around the host Earth . Earth's two apsides are the farthest point, aphelion , and the nearest point, perihelion , of its orbit around the host Sun. The terms aphelion and perihelion apply in the same way to the orbits of Jupiter and the other planets , the comets , and the asteroids of the Solar System . There are two apsides in any elliptic orbit . The name for each apsis

9360-696: The first group release since the Khrushchev Thaw in the mid-1950s. On 10 September, Boris Yeltsin wrote a letter of resignation to Gorbachev. At the 27 October plenary meeting of the Central Committee, Yeltsin, frustrated that Gorbachev had not addressed any of the issues outlined in his resignation letter, criticized the slow pace of reform, and servility to the general secretary. In his reply, Gorbachev accused Yeltsin of "political immaturity" and "absolute irresponsibility". Nevertheless, news of Yeltsin's insubordination and "secret speech" spread, and soon samizdat versions began to circulate. That marked

9477-530: The following days and months. The secession of the Baltic states was recognized in September 1991. The Belovezha Accords were signed on 8 December by President Boris Yeltsin of Russia , President Kravchuk of Ukraine , and Chairman Shushkevich of Belarus , recognizing each other's independence and creating the Commonwealth of Independent States (CIS) to replace the Soviet Union. Kazakhstan

9594-523: The future first president of independent Armenia Levon Ter-Petrossian , formed the eleven-member Karabakh Committee to lead and organize the new movement. On the same day, when Gorbachev replaced Baghirov with Vezirov as First Secretary of the Azerbaijan Communist Party, he also replaced Karen Demirchian with Suren Harutyunyan as First Secretary of the Communist Party of Armenia , however, Harutyunyan quickly decided to run before

9711-578: The homelands for different ethnicities. By late 1991, amid a catastrophic political crisis, with several republics already departing the Union and Gorbachev continuing the waning of centralized power, the leaders of three of its founding members , the Russian, Belorussian, and Ukrainian SSRs, declared that the Soviet Union no longer existed . Eight more republics joined their declaration shortly thereafter. Gorbachev resigned on 25 December 1991 and what

9828-483: The horizontal bars correspond to the extreme range of the orbit of the indicated body around the Sun. These extreme distances (between perihelion and aphelion) are the lines of apsides of the orbits of various objects around a host body. Distances of selected bodies of the Solar System from the Sun. The left and right edges of each bar correspond to the perihelion and aphelion of the body, respectively, hence long bars denote high orbital eccentricity . The radius of

9945-548: The hypersonic tracking sensors was imminent. In use: Research and development: Dissolution of the Soviet Union The Union of Soviet Socialist Republics (USSR) was formally dissolved as a sovereign state and subject of international law on 26 December 1991 by Declaration № 142-Н of the Soviet of the Republics of the Supreme Soviet of the Soviet Union . It also brought an end to

10062-471: The largest gathering of Ukrainian Catholics since Stalin outlawed the Church in 1946. On 4 August, which came to be known as "Bloody Thursday", local authorities violently suppressed a demonstration organized by the Democratic Front to Promote Perestroika. Forty-one people were detained, fined, or sentenced to 15 days of administrative arrest. On 1 September, local authorities violently displaced 5,000 students at

10179-460: The launching nations' territory. This is the phase after powered flight but before the apogee . It is significantly less challenging than boost phase intercepts, less costly, minimizes the potential impact of debris, and reduces the number of interceptors required to defeat a raid of missiles. This phase begins after the booster burns out and begins coasting in space. This can last as long as 20 minutes. Any debris remaining will burn up as it enters

10296-421: The lawyer Anatoly Sobchak . In the first session of the new Congress of People's Deputies (from 25 May to 9 June), hardliners retained control but reformers used the legislature as a platform for debate and criticism, which was broadcast live and uncensored. This transfixed the population since nothing like such a freewheeling debate had ever been witnessed in the Soviet Union. On 29 May, Yeltsin managed to secure

10413-510: The leading rebel republic. On 5 July 1988, when a contingent of troops was sent in to remove demonstrators by force from Yerevan's Zvartnots International Airport , shots were fired and one student protester was killed. In September, further large demonstrations in Yerevan led to the deployment of armored vehicles. In the autumn of 1988 almost all of the 200,000 Azerbaijani minority in Armenia

10530-861: The major conclusion of the Revolutions of 1989 and the end of the Cold War . In the aftermath of the Cold War , several of the former Soviet republics have retained close links with Russia and formed multilateral organizations such as the CIS, the Collective Security Treaty Organization (CSTO), the Eurasian Economic Union (EAEU), and the Union State , for economic and military cooperation. On

10647-489: The march and after a few incidents, dispersed the demonstrators. In 1988, Gorbachev started to lose control of two regions of the Soviet Union, as the Baltic republics were now leaning towards independence, and the Caucasus descended into violence and civil war. On 1 July 1988, the fourth and last day of a bruising 19th Party Conference, Gorbachev won the backing of the tired delegates for his last-minute proposal to create

10764-406: The missile boost phase is only from one to five minutes. It is the best time to track the missile because it is bright and hot. The missile defense interceptors and sensors must be in close proximity to the launch, which is not always possible. This is the most desirable interception phase because it destroys the missile early in flight at its most vulnerable point and the debris will typically fall on

10881-422: The most prominent Soviet dissident , returned to Moscow shortly after receiving a personal telephone call from Gorbachev telling him that after almost seven years his internal exile for defying the authorities was over. At the 28–30 January Central Committee plenum , Gorbachev suggested a new policy of demokratizatsiya throughout Soviet society. He proposed that future Communist Party elections should offer

10998-575: The nationalist wind and on 28 May, allowed Armenians to unfurl the red-blue-orange First Armenian Republic flag for the first time in almost 70 years to mark the 1918 declaration of the First Republic. On 15 June 1988, the Armenian Supreme Soviet adopted a resolution formally approving the idea of Nagorno-Karabakh's unification as part of the republic. Armenia, formerly one of the most loyal republics, had suddenly turned into

11115-467: The orbital motions of the planets around the Sun. The words are formed from the prefixes peri- (Greek: περί , near) and apo- (Greek: ἀπό , away from), affixed to the Greek word for the Sun, ( ἥλιος , or hēlíos ). Various related terms are used for other celestial objects . The suffixes -gee , -helion , -astron and -galacticon are frequently used in the astronomical literature when referring to

11232-429: The orbiting body when the latter is located: 1) at the periapsis point, or 2) at the apoapsis point (compare both graphics, second figure). The line of apsides denotes the distance of the line that joins the nearest and farthest points across an orbit; it also refers simply to the extreme range of an object orbiting a host body (see top figure; see third figure). In orbital mechanics , the apsides technically refer to

11349-482: The other hand, the Baltic states and all of the other former Warsaw Pact states became part of the European Union (EU) and joined NATO , while some of the other former Soviet republics like Ukraine, Georgia and Moldova have been publicly expressing interest in following the same path since the 1990s, despite Russian attempts to persuade them otherwise. Mikhail Gorbachev was elected General Secretary by

11466-588: The perihelion passage. For example, using an epoch of 1996, Comet Hale–Bopp shows perihelion on 1 April 1997. Using an epoch of 2008 shows a less accurate perihelion date of 30 March 1997. Short-period comets can be even more sensitive to the epoch selected. Using an epoch of 2005 shows 101P/Chernykh coming to perihelion on 25 December 2005, but using an epoch of 2012 produces a less accurate unperturbed perihelion date of 20 January 2006. Numerical integration shows dwarf planet Eris will come to perihelion around December 2257. Using an epoch of 2021, which

11583-409: The perturbing effects of the planets and other objects in the solar system (Milankovitch cycles). On a very long time scale, the dates of the perihelion and of the aphelion progress through the seasons, and they make one complete cycle in 22,000 to 26,000 years. There is a corresponding movement of the position of the stars as seen from Earth, called the apsidal precession . (This is closely related to

11700-409: The plane of Earth's orbit. Indeed, at both perihelion and aphelion it is summer in one hemisphere while it is winter in the other one. Winter falls on the hemisphere where sunlight strikes least directly, and summer falls where sunlight strikes most directly, regardless of the Earth's distance from the Sun. In the northern hemisphere, summer occurs at the same time as aphelion, when solar radiation

11817-488: The planet takes longer to orbit from June solstice to September equinox than it does from December solstice to March equinox. Therefore, summer in the northern hemisphere lasts slightly longer (93 days) than summer in the southern hemisphere (89 days). Astronomers commonly express the timing of perihelion relative to the First Point of Aries not in terms of days and hours, but rather as an angle of orbital displacement,

11934-472: The planets of the Solar System as seen from above the northern pole of Earth's ecliptic plane , which is coplanar with Earth's orbital plane . The planets travel counterclockwise around the Sun and for each planet, the blue part of their orbit travels north of the ecliptic plane, the pink part travels south, and dots mark perihelion (green) and aphelion (orange). The first image (below-left) features

12051-731: The republic's legislature in November 1988 calling for Georgia's independence and in support of Estonia's declaration of sovereignty. Beginning in February 1988, the Democratic Movement of Moldova (formerly Moldavia) organized public meetings, demonstrations, and song festivals, which gradually grew in size and intensity. In the streets, the center of public manifestations was the Stephen the Great Monument in Chișinău, and

12168-587: The republics had already been scheduled to take place between December and March 1990. The six Warsaw Pact countries of Eastern Europe, while nominally independent, were widely recognized as the Soviet satellite states (along with Mongolia ). All had been occupied by the Soviet Red Army in 1945, had Soviet-style socialist states imposed upon them, and had very restricted freedom of action in either domestic or international affairs. Any moves towards real independence were suppressed by military force – in

12285-652: The second anniversary of the Chernobyl nuclear disaster, carrying placards with slogans like "Openness and Democracy to the End". Between May and June 1988, Ukrainian Catholics in western Ukraine celebrated the Millennium of Christianity in Kyivan Rus in secret by holding services in the forests of Buniv, Kalush , Hoshi, and Zarvanytsia. On 5 June 1988, as the official celebrations of the Millennium were held in Moscow,

12402-508: The short term, such dates can vary up to 2 days from one year to another. This significant variation is due to the presence of the Moon: while the Earth–Moon barycenter is moving on a stable orbit around the Sun, the position of the Earth's center which is on average about 4,700 kilometres (2,900 mi) from the barycenter, could be shifted in any direction from it—and this affects the timing of

12519-405: The so-called longitude of the periapsis (also called longitude of the pericenter). For the orbit of the Earth, this is called the longitude of perihelion , and in 2000 it was about 282.895°; by 2010, this had advanced by a small fraction of a degree to about 283.067°, i.e. a mean increase of 62" per year. For the orbit of the Earth around the Sun, the time of apsis is often expressed in terms of

12636-430: The square by force, and imposed a curfew that lasted ten months. The rebellion of fellow Armenians in Nagorno-Karabakh had an immediate effect in Armenia itself. Daily demonstrations, which began in the Armenian capital Yerevan on 18 February, initially attracted few people, but each day the Nagorno-Karabakh issue became increasingly prominent and the numbers swelled. On 20 February, a 30,000-strong crowd demonstrated in

12753-625: The territory of Estonia's borders. At the same time the Estonian Citizens' Committees started registration of citizens of the Republic of Estonia to carry out the elections of the Congress of Estonia . The Latvian Popular Front was founded in June 1988. On 4 October, Gorbachev replaced Boris Pugo , the "old guard" leader of the Communist Party of Latvia , with the more liberal Jānis Vagris. In October 1988 Vagris bowed to pressure from

12870-405: The two bodies may lie well within the bigger body—e.g., the Earth–Moon barycenter is about 75% of the way from Earth's center to its surface. If, compared to the larger mass, the smaller mass is negligible (e.g., for satellites), then the orbital parameters are independent of the smaller mass. When used as a suffix—that is, -apsis —the term can refer to the two distances from the primary body to

12987-491: The two distances is the length of the semi-minor axis b . The geometric mean of the two limiting speeds is which is the speed of a body in a circular orbit whose radius is a {\displaystyle a} . Orbital elements such as the time of perihelion passage are defined at the epoch chosen using an unperturbed two-body solution that does not account for the n-body problem . To get an accurate time of perihelion passage you need to use an epoch close to

13104-465: The vanguard of the Baltic states in pressing for reform. In 1988, Estonia took over the lead role with the foundation of the Soviet Union's first popular front and starting to influence state policy. The Estonian Popular Front was founded in April 1988. On 16 June 1988, Gorbachev replaced Karl Vaino , the "old guard" leader of the Communist Party of Estonia , with the comparatively liberal Vaino Väljas . In late June 1988, Väljas bowed to pressure from

13221-785: Was approved by the MDA Director in 2007. The general strategy for international efforts is: As of 2017 MDA was working on facilities in Germany, Romania, Poland, Japan, Qatar, Saudi Arabia and the United Arab Emirates. Ballistic missile systems using advanced liquid- or solid-propellant propulsion are becoming more mobile, accurate and capable of striking targets over longer distances and are proliferating worldwide. MDA will be using multiple technologies to defend Guam. MDA divides its systems into four phases: boost; ascent; mid-course; and terminal. Each of these corresponds to

13338-537: Was expelled by Armenian nationalists, with over 100 killed in the process. That, after the Sumgait pogrom earlier that year, which had been carried out by Azerbaijanis to ethnic Armenians and led to the expulsion of Armenians from Azerbaijan, was for many Armenians considered an act of revenge for the killings at Sumgait. On 25 November 1988, a military commandant took control of Yerevan as the Soviet government moved to prevent further ethnic violence. On 7 December 1988,

13455-454: Was left of the Soviet parliament voted to dissolve the union. The process began with growing unrest in the country's various constituent national republics developing into an incessant political and legislative conflict between them and the central government. Estonia was the first Soviet republic to declare state sovereignty inside the Union on 16 November 1988. Lithuania was the first republic to declare full independence restored from

13572-546: Was the last republic to leave the Union, proclaiming independence on 16 December. All the ex-Soviet republics, with the exception of Georgia and the Baltic states, joined the CIS on 21 December, signing the Alma-Ata Protocol . Russia, as by far the largest and most populous republic, became the USSR's de facto successor state . On 25 December, Gorbachev resigned and turned over his presidential powers—including control of

13689-595: Was the uncensored live TV coverage of the legislature's deliberations, where people witnessed the previously feared Communist leadership being questioned and held accountable. This example fueled a limited experiment with democracy in Poland , which quickly led to the toppling of the Communist government in Warsaw that summer and in turn sparked uprisings that overthrew governments in the other five Warsaw Pact countries before

#685314