March equinox#Iranian tradition

The point where the Sun crosses the celestial equator northwards is called the First Point of Aries. However, due to the precession of the equinoxes, this point is no longer in the constellation Aries, but rather in Pisces.{{cite book |title=Spherical Astronomy |url=https://books.google.com/books?id=9KFRhcsn8-UC&pg=PA233 |publisher=Krishna Prakashan Media |pages=233ff |id=GGKEY:RDRHQ35FBX7}} By the year 2600 it will be in Aquarius. The Earth's axis causes the First Point of Aries to travel westwards across the sky at a rate of roughly one degree every 72 years. Based on the modern constellation boundaries, the northward equinox passed from Taurus into Aries in the year −1865 (1866 BC), passed into Pisces in the year −67 (68 BC), will pass into Aquarius in the year 2597, and will pass into Capricornus in the year 4312. It passed by (but not into) a 'corner' of Cetus at 0°10′ distance in the year 1489.{{cn|date=March 2020}}

{{See also|Equinox#Length of equinoctial day and night}}

In its apparent motion on the day of an equinox, the Sun's disk crosses the Earth's horizon directly to the east at sunrise; and again, some 12 hours later, directly to the west at sunset. The March equinox, like all equinoxes, is characterized by having an almost exactly equal amount of daylight and night across most latitudes on Earth.{{Cite web |url=https://www.vox.com/science-and-health/2020/3/19/21186591/spring-equinox-2020-march-19 |title=The spring equinox is Thursday: 8 things to know about the first day of spring |last=Resnick |first=Brian |date=19 March 2020 |website=Vox |language=en |access-date=20 March 2020}}

{{See also|September equinox#Culture}}

The Babylonian calendar began with the first new moon after the March equinox, the day after the return of the Sumerian goddess Inanna (later known as Ishtar) from the underworld, in the Akitu ceremony, with parades through the Ishtar Gate to the Eanna temple and the ritual re-enactment of the marriage to Tammuz, or Sumerian Dummuzi.{{cn|date=March 2019}}

The Persian calendar begins each year at the northward equinox, observationally determined at Tehran.{{Cite web |url=http://individual.utoronto.ca/kalendis/seasons.htm |title=The Lengths of the Seasons |last=Bromberg |first=Irv |publisher=University of Toronto, Canada |access-date=6 July 2013}}

The Indian national calendar starts the year on the day next to the vernal equinox on March 22 (March 21 during leap years) with a 30-day month (31 days in leap years), then has 5 months of 31 days followed by 6 months of 30 days.

{{Main|Julian calendar}}

The Julian calendar reform lengthened seven months and replaced the intercalary month with an intercalary day to be added every four years to February. It was based on a length for the year of 365 days and 6 hours (365.25 d), while the mean tropical year is about 11 minutes and 15 seconds less than that. This had the effect of adding about three quarters of an hour every four years. The effect accumulated from inception in 45 BC and by the 16th century, the northern vernal equinox fell on March 10 or 11.{{cite book

| last1 = Blackburn

| first1 = Bonnie

| authorlink1 = Bonnie J. Blackburn

| first2 = Leofranc

| last2 = Holford-Strevens

| authorlink2 = Leofranc Holford-Strevens

| title = The Oxford companion to the Year: An exploration of calendar customs and time-reckoning

| publisher = Oxford University Press

| year = 2003

| isbn = 0-19-214231-3

| page = [https://archive.org/details/oxfordcompaniont00blac/page/683 683]

| url-access = registration

| url = https://archive.org/details/oxfordcompaniont00blac/page/683

}} Corrected reprinting of original 1999 edition. Since the date of the equinox is critical to calculation of the date of Easter, its drift from astronomical reality was of grave concern to the Catholic church. It was for this reason that the Gregorian calendar reform was introduced in 1582, to reinstate the date to about 21 March and to minimise any further drifting. Since 1900, the calendars differ by 13 days: from 1 March 2100, the difference will become 14 days.

File:Nowruz Zoroastrian.jpg in Persepolis, a symbol of Iranian Nowruz: a bull (symbolizing the Earth) and lion (the Sun) in eternal combat are equal in power on the equinox.]]

File:ChichenItzaEquinox.jpg during the spring equinox—Kukulkan, the famous descent of the snake]]

• The Jewish Passover usually falls on the first full moon after the Northern Hemisphere vernal equinox,{{cite web |last=Burnaby |first=Sherrard Beaumont |year=1901 |title=Elements of the Jewish and Muhammedan calendars with rules and tables and explanatory notes on the Julian and Gregorian calendars.|url=http://www.archive.org/details/elementsofjewish00burnuoft/page/13/mode/2up |pages=13{{ndash}}14 |location=London}} although occasionally (currently three times every 19 years{{cn|date=July 2023}}) it will occur on the second full moon.{{cite web |last=Burnaby |first=Sherrard Beaumont |year=1901 |title=Elements of the Jewish and Muhammedan calendars with rules and tables and explanatory notes on the Julian and Gregorian calendars. |url=http://www.archive.org/details/elementsofjewish00burnuoft/page/9/mode/2up |pages=9{{ndash}}10 |location=London}}
• The Christian Churches calculate Easter as the first Sunday after the first full moon on or after the March equinox. The official church definition for the equinox is March 21. The Eastern Orthodox Churches use the older Julian calendar, while the western churches use the Gregorian calendar, and the western full moons currently fall four, five or 34 days before the eastern ones. The result is that the two Easters generally fall on different days but they sometimes coincide. The earliest possible western Easter date in any year is March 22 on each calendar. The latest possible western Easter date in any year is April 25.{{Cite web |url=http://home.hiwaay.net/~krcool/Astro/moon/ |title=Keith's Moon Facts |last=Cooley |first=Keith |date=2001 |publisher=Hiwaay.net personal pages}}{{sps|certain=yes|date=March 2017}}

• The northward equinox marks the first day of various calendars including the Iranian calendar. The ancient Iranian peoples' new year's festival of Nowruz can be celebrated March 20 or March 21. According to the ancient Persian mythology Jamshid, the mythological king of Persia, ascended to the throne on this day and each year this is commemorated with festivities for two weeks. Along with Iranian peoples, it is also a holiday celebrated by Turkic people, the North Caucasus and in Albania. It is also a holiday for Zoroastrians, adherents of the Baháʼí Faith and Nizari Ismaili Muslims irrespective of ethnicity.{{Cite web |url=https://the.ismaili/navroz |title=Navroz |website=The Ismaili |publisher=Islamic Publications Limited |access-date=4 July 2011}}

• In many Arab countries, Mother's Day is celebrated on the northward equinox.{{cn|date=March 2019}}
• Sham el-Nessim is a modern celebration which is claimed by some to have been celebrated in ancient Egypt but with little evidence. It is one of the public holidays in Egypt. It is assumed by some that sometime during Egypt's Christian period ({{Circa|200}}–639) the date moved to Easter Monday, but before then it coincided with the vernal equinox.{{cn|date=March 2019}}

{{main|South and Southeast Asian New Year}}

According to the sidereal solar calendar, celebrations which originally coincided with the March equinox now take place throughout South Asia and parts of Southeast Asia on the day when the Sun enters the sidereal Aries, generally around April 14.

• In Cambodia, the Angkor Wat Equinox is a solar phenomenon which dates back to the reign of Suryavarman II.

• The traditional East Asian calendars divide a year into 24 solar terms (节气, literally "climatic segments"), and the vernal equinox (Chūnfēn, {{CJKV|t=春分|s=春分|j=春分|k=춘분|v=Xuân phân}}) marks the middle of the spring. In this context, the Chinese character 分 means "(equal) division" (within a season).
• In Japan, Vernal Equinox Day (春分の日 Shunbun no hi) is an official national holiday, and is spent visiting family graves and holding family reunions.{{Cite book |last=Yoneyuki Sugita |url=https://books.google.com/books?id=aI7gDAAAQBAJ&pg=PA23 |title=Social Commentary on State and Society in Modern Japan |date=18 August 2016 |publisher=Springer |isbn=978-981-10-2395-8 |pages=23}} Higan (お彼岸) is a Buddhist holiday exclusively celebrated by Japanese sects during both the Spring and Autumnal Equinox.{{Cite book |last=Milton Walter Meyer |url=https://archive.org/details/japanconcisehist00meye |title=Japan: A Concise History |publisher=Rowman & Littlefield |year=1993 |isbn=978-0-8226-3018-0 |pages=[https://archive.org/details/japanconcisehist00meye/page/246 246] |url-access=registration}}

File:Equinozio da Pizzo Vento,tramonto fondachelli fantina, sicilia.JPG, Sicily]]

• Dita e Verës or Verëza is the Albanian pagan feast that celebrates the spring equinox: the beginning of the spring-summer period. It is traditionally celebrated throughout Albanian inhabited territories, also officially in Albania.
• Hilaria was an ancient Roman festival commemorating the death and resurrection of Attis.
• Lieldienas
• in Norse paganism, a Dísablót was celebrated on the vernal equinox.{{Cite web |url=http://www.ne.se/sok/D%C3%ADsabl%C3%B3t?type=NE |title=Disablót |website=Nationalencyklopedin |language=sv}}
• Drowning of Marzanna

• Spring equinox in Teotihuacán
• The reconstructed Cahokia Woodhenge, a large timber circle located at the Mississippian culture Cahokia archaeological site near Collinsville, Illinois,{{Cite web |url=https://www.greatriverroad.com/mgr-attractions-2/woodhenge |title=Visitors Guide to the Woodhenge |date=8 January 2019 |access-date=21 December 2019}} is the site of annual equinox and solstice sunrise observances. Out of respect for Native American beliefs these events do not feature ceremonies or rituals of any kind.{{Cite web |url=https://www.dnr.illinois.gov/news/Pages/Welcome-the-Fall-Equinox-at-Cahokia-Mounds.aspx |title=Welcome the Fall Equinox at Cahokia Mounds |last=Iseminger, William |publisher=Illinois Department of Natural Resources |access-date=20 December 2017}}{{Cite web |url=http://www.discovercollinsville.com/events/details/winter-solstice-sunrise-observance-at-cahokia-mounds-3895 |title=Winter Solstice Sunrise Observance at Cahokia Mounds |publisher=Collinsville Chamber of Commerce |access-date=20 December 2017}}{{Cite news |url=https://indiancountrymedianetwork.com/travel/destinations/spring-equinox-cahokia-mounds/ |title=Cahokia Mounds Mark Spring Equinox : The keepers of Cahokia Mounds will host a spring gathering to celebrate the vernal equinox |work=Indian Country Today |access-date=20 December 2017 |publisher=Indian Country Media Network}}

• World Storytelling Day is a global celebration of the art of oral storytelling, celebrated every year on the day of the northward equinox.{{cn|date=March 2019}}
• World Citizen Day occurs on the northward equinox.{{Cite web |url=http://www.recim.org/ascop/pr08-an.htm |title=World Citizens Day—World Unity Day |year=2007 |publisher=Consultative Assembly of the Peoples Congress}}
• The Baháʼí calendar year starts at the sunset preceding the March equinox calculated for Tehran.{{Cite web |url=http://www.bahai.us/2011/03/20/with-spring-comes-the-bahai-new-year/ |title=With Spring comes the Baháʼí New Year |publisher=National Spiritual Assembly of the Baháʼís of the United States |url-status=dead |archive-url=https://web.archive.org/web/20110928151857/http://www.bahai.us/2011/03/20/with-spring-comes-the-bahai-new-year/ |archive-date=28 September 2011 |access-date=4 July 2011}}
• In Annapolis, Maryland, United States, boatyard employees and sailboat owners celebrate the spring equinox with the "Burning of the Socks" festival. Traditionally, the boating community wears socks only during the winter. These are burned at the approach of warmer weather, which brings more customers and work to the area. Officially, nobody then wears socks until the next equinox.{{Cite news |url=https://apnews.com/article/d634582ec30240fe74571ae163406910 |title=Annapolis Welcomes Spring by Burning Socks |last=Wyatt |first=Kristen |website=Associated Press |location=Annapolis, Maryland| access-date=15 February 2022}}{{Cite web |url=http://www.hometownannapolis.com/news/can/2011/03/25-08/Around-Annapolis-Hillsmere-joins-in-sock-burning-tradition.html |title=Hillsmere Joins in Sock Burning Tradition |last=Rey |first=Diane |website=The Capital |location=Annapolis, Maryland |access-date=25 April 2011}}
• Neopagans observe the March equinox (referred to as Ostara) as a cardinal point on the Wheel of the Year. In the northern hemisphere some varieties of paganism adapt vernal equinox celebrations, while in the southern hemisphere pagans adapt autumnal traditions.{{cn|date=March 2019}}
• International Astrology Day{{cn|date=March 2019}}
• On March 20, 2014 and March 20, 2018 the March equinox was commemorated by an animated Google Doodle.{{Cite news |last=Gander |first=Kashmira |url=https://www.independent.co.uk/life-style/gadgets-and-tech/news/first-day-of-spring-google-doodle-celebrates-the-spring-equinox-9203809.html |title=Spring equinox 2014: First day of spring marked by Google Doodle |date=20 March 2014 |work=The Independent |access-date=20 March 2014 |location=London}}

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• June solstice
• September equinox
• December solstice

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{{Reflist|30em}}

• {{cite web

| url = http://www.knowth.com/loughcrew-equinox.htm

| title = Ancient Equinox Alignment

| work = Loughcrew, Ireland

}}

• {{webarchive |url=https://web.archive.org/web/20190610032303/http://ns1763.ca/equinox/eqindex.html |date=June 10, 2019 |title=Dates and times of the Northward equinox}}
• [https://www.npr.org/2020/03/19/817237429/spring-starts-today-all-over-america-which-is-weird Spring Starts Today All Over America, Which Is Weird] (March 19, 2020)

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