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The March equinox is known as the vernal equinox (spring equinox) in the Northern Hemisphere and as the autumnal equinox (autumn equinox or fall equinox) in the Southern Hemisphere. [ 8 ][ 7 ][ 10 ] On the Gregorian calendar, the northward equinox can occur as early as 19 March or as late as 21 March at 0° longitude.
Equinox. A solar equinox is a moment in time when the Sun crosses the Earth's equator, which is to say, appears directly above the equator, rather than north or south of the equator. On the day of the equinox, the Sun appears to rise "due east" and set "due west". This occurs twice each year, around 20 March and 23 September.
The date of Easter is determined as the first Sunday after the "paschal full moon" that falls on or after March 21. (March 21 is the ecclesiastical equinox, the date fixed by the Gregorian reform of the calendar as a fixed reference date for the Spring Equinox in the Northern hemisphere; the actual Equinox can fall on March 19, 20 or 21).
Vernal Equinox Day (春分の日, Shunbun no Hi) is a public holiday in Japan that occurs on the date of the Northward equinox in Japan Standard Time (the vernal equinox can occur on different dates in different time-zones), usually March 20 or 21.
In 1818 the Paschal Full Moon fell on Saturday, March 21 (the equinox). Therefore, the following day, March 22 and the 81st day of the year, was Easter. It will not fall as early again until 2285, a span of 467 years. The next earliest Easter, March 23, in that timespan occurred in 1845, 1856, 1913, and 2008. Easter will next occur on March 23 in 2160. These are gaps of 11, 57, 95 and 152 ...
The first day of the Iranian calendar falls on the March equinox, the first day of spring, around 21 March. In the 11th century AD the Iranian calendar was reformed by Omar Khayyam in order to fix the beginning of the calendar year, i.e. Nowruz, at the vernal equinox. Accordingly, the definition of Nowruz given by the Iranian astronomer Tusi was the following: "the first day of the official ...
First point of Aries. The first point of Aries defines the ecliptic coordinate of (0°, 0°). It is on the celestial equator at both the left and right extremes of the sky chart, with the ecliptic (the orange dotted sine curve) passing through it. The first point of Aries, also known as the cusp of Aries, is the location of the March equinox ...
In the Fasli / Bastani variant of the Zoroastrian calendar, this day is always the day of the spring equinox (nominally falling on March 21). In the Shahenshahi and Kadmi yuppa, which do not account for leap years, the New Year's Day has drifted ahead by over 200 days.