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UT date and time of equinoxes and solstices on Earth[1][2]
event
equinox
solstice
equinox
solstice
month
March[3]
June[4]
September[5]
December[6]
year
day
time
day
time
day
time
day
time
2019
20
21:58
21
15:54
23
07:50
22
04:19
2020
20
03:50
20
21:43
22
13:31
21
10:03
2021
20
09:37
21
03:32
22
19:21
21
15:59
2022
20
15:33
21
09:14
23
01:04
21
21:48
2023
20
21:25
21
14:58
23
06:50
22
03:28
2024
20
03:07
20
20:51
22
12:44
21
09:20
2025
20
09:02
21
02:42
22
18:20
21
15:03
2026
20
14:46
21
08:25
23
00:06
21
20:50
2027
20
20:25
21
14:11
23
06:02
22
02:43
2028
20
02:17
20
20:02
22
11:45
21
08:20
2029
20
08:01
21
01:48
22
17:37
21
14:14
Illumination of Earth by the Sun on the day of an equinox
The March equinox[7][8] or northward equinox[9] is the equinox on the Earth when the subsolar point appears to leave the Southern Hemisphere and cross the celestial equator, heading northward as seen from Earth. 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. For a common year the computed time slippage is about 5 hours 49 minutes later than the previous year, and for a leap year about 18 hours 11 minutes earlier than the previous year. Balancing the increases of the common years against the losses of the leap years keeps the calendar date of the March equinox from drifting more than one day from 20 March each year.
The March equinox may be taken to mark the beginning of astronomical spring and the end of astronomical winter in the Northern Hemisphere but marks the beginning of astronomical autumn and the end of astronomical summer in the Southern Hemisphere.[11]
In astronomy, the March equinox is the zero point of sidereal time and, consequently, the right ascension and ecliptic longitude.[12] It also serves as a reference for calendars and celebrations in many cultures and religions.
^Astronomical Applications Department of USNO. "Earth's Seasons - Equinoxes, Solstices, Perihelion, and Aphelion". Retrieved 1 August 2022.
^"Solstices and Equinoxes: 2001 to 2100". AstroPixels.com. 20 February 2018. Retrieved 21 December 2018.
^Équinoxe de printemps entre 1583 et 2999
^Solstice d’été de 1583 à 2999
^Équinoxe d’automne de 1583 à 2999
^Solstice d’hiver
^ abSerway, Raymond; Jewett, John (8 January 2013). Physics for Scientists and Engineers. Cengage Learning. p. 409. ISBN 978-1-285-53187-8.
^ abUnited States Naval Training Command (1972). Navigation compendium. U.S. Govt. Print. Off. p. 88.
^"Embracing the Equinox". Night Sky Network. Jet Propulsion Laboratory. 18 February 2022. Retrieved 19 July 2022.
^Desonie, Dana (2008). Polar Regions: Human Impacts. Infobase Publishing. p. 6. ISBN 978-1-4381-0569-7.
^"Defining Seasons". timeanddate.com.
^Zeilik, M.; Gregory, S. A. (1998). Introductory Astronomy & Astrophysics (4th ed.). Saunders College Publishing. p. 36. ISBN 0030062284.
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