They occur around 20 March and 23 September.
There are two equinoxes per year, separated by about 6 months. There will never be two equinoxes in one month.
The two equinoxes.
August and July are the two months in the Gregorian calendar that do not have a solstice or an equinox.
The two seasons that begin with solstices rather than equinoxes are summer and winter.
There are two equinoxes (i.e. vernal/spring and autumnal/fall) every year.
At the Equator at the two Equinoxes, Spring and Fall.
Equinoxes
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91 and a fraction days. The dividing points are the two solstices and two equinoxes. You can see the precise dates of the equinoxes and solstices on the "Earth's Seasons" web site at the US Naval Observatory, at the link below.
At the two equinoxes (about 22 September and 20 March).
The year has two equinoxes, which are the days on which the night and day are of equal length. They happen when the apparent position of the Sun (on the ecliptic) crosses the Earth's equator.The equinoxes are usually March 21 and September 22, and on those days the Sun has a declination of zero and is overhead at the equator.
The year has two equinoxes, which are the days on which the night and day are of equal length. They happen when the apparent position of the Sun (on the ecliptic) crosses the Earth's equator.The equinoxes are usually March 21 and September 22, and on those days the Sun has a declination of zero and is overhead at the equator.