An equinox occurs when the length of the day is equal to the length of the night. Here on Earth, it occurs around March 21 (the Vernal Equinox) and September 21 (the Autumnal Equinox).
Equinoxes
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.
On the equinoxes, the sun's direct rays fall on the equator. This causes day and night to be of equal length all over the world.
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.
Day and night are of equal length (practically the definition of equinox)
Respectively, they are the southernmost and northernmost latitudes where the sun may be directly overhead. Each tropic experiences this phenomenon once per year, on the equinoxes of December and June respectively.
Equinoxes
Equinoxes is a noun. It's the plural form of equinox.
No, the solstices and equinoxes mark the beginnings of the four seasons.
At the Equinoxes, the Sun is directly above the equator.
The equinoxes and solstices are the first days of seasons. On the equinoxes, night and day is the same length. On the solstices, the day is either the longest or the shortest day of the year, depending on which solstice it is and which hemisphere you are in,
summer and winter
On Equinoxes
There are two equinoxes per year, separated by about 6 months. There will never be two equinoxes in one month.
The two seasons that begin with solstices rather than equinoxes are summer and winter.
They're widely and erroneously known as the equinoxes, but they're not.The equinoxes are points on the map of the sky, not points in time.March 21 and September 21 are the dates near which the sun reachesand passes the equinoxes.
These are on or about the equinoxes