September is the ninth month of the year in the Gregorian calendar and interchangeably the ninth or tenth month in the less commonly used Julian calendar . In the modern Gregorian calendar, its length is 30 days.
27-734: September in the Northern Hemisphere and March in the Southern Hemisphere are seasonally equivalent. In the Northern hemisphere, the beginning of the meteorological autumn is on 1 September. In the Southern hemisphere, the beginning of the meteorological spring is on 1 September. September marks the beginning of the ecclesiastical year in the Eastern Orthodox Church . It is the start of
54-632: A counterclockwise pattern. Hurricanes and tropical storms (massive low-pressure systems) spin counterclockwise in the Northern Hemisphere. The shadow of a sundial moves clockwise on latitudes north of the subsolar point and anticlockwise to the south. During the day at these latitudes, the Sun tends to rise to its maximum at a southerly position. Between the Tropic of Cancer and the Equator,
81-545: A day. Ancient Roman observances for September include Ludi Romani , originally celebrated from September 12 to September 14, later extended to September 5 to September 19. In the 1st century BC, an extra day was added in honor of the deified Julius Caesar on 4 September. Epulum Jovis was held on September 13. Ludi Triumphales was held from September 18–22. The Septimontium was celebrated in September, and on December 11 on later calendars. These dates do not correspond to
108-558: A small part of South America . During the 2.5 million years of the Pleistocene , numerous cold phases called glacials ( Quaternary ice age ), or significant advances of continental ice sheets, in Europe and North America , occurred at intervals of approximately 40,000 to 100,000 years. The long glacial periods were separated by more temperate and shorter interglacials which lasted about 10,000–15,000 years. The last cold episode of
135-488: Is mostly in the sixth month of the astrological calendar (and the first part of the seventh), which begins at the end of March/Mars/Aries. September's birthstone is the sapphire . The birth flowers are the forget-me-not , morning glory and aster . The zodiac signs are Virgo (until September 22) and Libra (September 23 onward). This list does not necessarily imply either official status or general observance. Northern Hemisphere The Northern Hemisphere
162-410: Is now Galatella linosyris . Many species and a variety of hybrids and varieties are popular as garden plants because of their beautiful, attractive and colourful flowers. Aster species are used as food plants by the larvae of a number of Lepidoptera species—see list of Lepidoptera that feed on Aster . Asters can grow in all hardiness zones. Selected species: Those marked agm have gained
189-589: Is the half of Earth that is north of the Equator . For other planets in the Solar System , north is defined as being in the same celestial hemisphere relative to the invariable plane of the Solar System as Earth's North Pole . Due to Earth's axial tilt of 23.439281°, there is a seasonal variation in the lengths of the day and night. There is also a seasonal variation in temperatures, which lags
216-593: The Gregorian calendar . In the British Empire that year, September 2 was immediately followed by September 14 . On Usenet , it is said that September 1993 ( Eternal September ) never ended. In the United States, September is one of the most common birth months (third most popular after August and July, which both have 31 days), as all but one Top 10 most common birthdays are in September, based on
243-743: The National Center for Health Statistics statistics on births between 1994 and 2014. The most common birthday is September 9 (#1), least common is September 1 (#250). The September equinox takes place in this month, and certain observances are organized around it. It is the Autumn equinox in the Northern Hemisphere, and the Vernal equinox in the Southern Hemisphere. The dates can vary from 21 September to 24 September (in UTC ). September
270-465: The Northern temperate zone . The changes in these regions between summer and winter are generally mild, rather than extreme hot or cold. However, a temperate climate can have very unpredictable weather. Tropical regions (between the Tropic of Cancer and the Equator, 0° latitude) are generally hot all year round and tend to experience a rainy season during the summer months, and a dry season during
297-690: The Royal Horticultural Society 's Award of Garden Merit . The Hungarian revolution of 31 October 1918, became known as the " Aster Revolution " due to protesters in Budapest wearing this flower. One of the few flowers left around Michaelmas in the British Isles is the Michaelmas daisy (another name for asters), hence the rhyme: "The Michaelmas daisies, among dead weeds, Bloom for St Michael's valorous deeds..." In
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#1732750817564324-399: The academic year in many countries of the northern hemisphere, in which children go back to school after the summer break , sometimes on the first day of the month . Some Libras and Virgos are born in September, with Virgos being born on September 1st through September 22nd and Libras September 23rd through September 30 . September (from Latin septem , "seven") was originally
351-483: The calendar year and the astronomical year . Within the Northern Hemisphere, oceanic currents can change the weather patterns that affect many factors within the north coast. Such events include El Niño–Southern Oscillation . Trade winds blow from east to west just above the equator. The winds pull surface water with them, creating currents, which flow westward due to the Coriolis effect . The currents then bend to
378-583: The last glacial period ended about 10,000 years ago. Earth is currently in an interglacial period of the Quaternary , called the Holocene . The glaciations that occurred during the glacial period covered many areas of the Northern Hemisphere. The Arctic is a region around the North Pole (90° latitude ). Its climate is characterized by cold winters and cool summers. Precipitation mostly comes in
405-539: The Northern Hemisphere compared to the Southern Hemisphere, making the Northern Hemisphere more suitable for deep-space observation, as it is not "blinded" by the Milky Way. As of 2015, the Northern Hemisphere is home to approximately 6.4 billion people, which is around 87.0% of the Earth's total human population of 7.3 billion people. Aster (genus) Aster is a genus of perennial flowering plants in
432-606: The Sun can be seen to the north, directly overhead, or to the south at noon, depending on the time of year. In the Southern Hemisphere, the midday Sun is predominantly in the north. When viewed from the Northern Hemisphere, the Moon appears inverted compared to a view from the Southern Hemisphere. The North Pole faces away from the Galactic Center of the Milky Way . This results in the Milky Way being sparser and dimmer in
459-540: The family Asteraceae . Its circumscription has been narrowed, and it now encompasses around 170 species, all but one of which are restricted to Eurasia ; many species formerly in Aster are now in other genera of the tribe Astereae . Aster amellus is the type species of the genus and the family Asteraceae. The name Aster comes from the Ancient Greek word ἀστήρ ( astḗr ), meaning "star", referring to
486-652: The form of snow. Areas inside the Arctic Circle (66°34′ latitude) experience some days in summer when the Sun never sets, and some days during the winter when it never rises. The duration of these phases varies from one day for locations right on the Arctic Circle to several months near the Pole, which is the middle of the Northern Hemisphere. Between the Arctic Circle and the Tropic of Cancer (23°26′ latitude) lies
513-562: The genus during the 1990s, it was decided that the North American species are better treated in a series of other related genera. After this split there are roughly 180 species within the genus, all but one being confined to Eurasia. The New World species have now been reclassified in the genera Almutaster , Canadanthus , Doellingeria , Eucephalus , Eurybia , Ionactis , Oligoneuron , Oreostemma , Sericocarpus and Symphyotrichum , though all are treated within
540-722: The modern Gregorian calendar. September was called the "harvest month" in Charlemagne 's calendar. September corresponds partly to the Fructidor and partly to the Vendémiaire of the first French republic . September is called Herbstmonat , harvest month, in Switzerland. The Anglo-Saxons called the month Gerstmonath , barley month, that crop being then usually harvested. In 1752, the British Empire adopted
567-468: The right, heading north. At about 30 degrees north latitude, a different set of winds, the westerlies , push the currents back to the east, producing a closed clockwise loop. Its surface is 60.7% water, compared with 80.9% water in the case of the Southern Hemisphere , and it contains 67.3% of Earth's land. The continents of North America and mainland Eurasia are located entirely in the Northern Hemisphere, together with about two-thirds of Africa and
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#1732750817564594-523: The same tribe, Astereae . The "China aster" is in the related genus Callistephus . Regardless of the taxonomic change, most are still widely referred to as "asters", or " Michaelmas daisies", because of their typical blooming period. Plants of the World Online accepts 186 species as of August 2024. The species formerly known as Aster tripolium (sea aster) is now Tripolium pannonicum . The species formerly known as Aster linosyris (goldilocks)
621-508: The seventh month in the oldest known Roman calendar , the calendar of Romulus c. 750 BC , with March being (Latin Martius ) the first month of the year until perhaps as late as 451 BC. After the calendar reform that added January and February to the beginning of the year, September became the ninth month but retained its name. It had 29 days until the Julian reform, which added
648-531: The shape of the flower head . Many species and a variety of hybrids and varieties are popular as garden plants because of their attractive and colourful flowers. 'Aster' species are used as food plants by the larvae of a number of Lepidoptera species—see list of Lepidoptera that feed on Aster . Asters can grow in all hardiness zones. The genus Aster once contained nearly 600 species in Eurasia and North America, but after morphologic and molecular research on
675-612: The variation in day and night. Conventionally, winter in the Northern Hemisphere is taken as the period from the December solstice (typically December 21 UTC ) to the March equinox (typically March 20 UTC), while summer is taken as the period from the June solstice through to the September equinox (typically on 23 September UTC). The dates vary each year due to the difference between
702-448: The weather patterns that affect many factors within the north coast. For the same reason, flows of air down toward the northern surface of the Earth tend to spread across the surface in a clockwise pattern. Thus, clockwise air circulation is characteristic of high pressure weather cells in the Northern Hemisphere. Conversely, air rising from the northern surface of the Earth (creating a region of low pressure) tends to draw air toward it in
729-489: The winter months. In the Northern Hemisphere, objects moving across or above the surface of the Earth tend to turn to the right because of the Coriolis effect . As a result, large-scale horizontal flows of air or water tend to form clockwise-turning gyres . These are best seen in ocean circulation patterns in the North Atlantic and North Pacific oceans. Within the Northern Hemisphere, oceanic currents can change
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