Autumnal Equinox

What is meaning of Autumnal equinox ?

The equinoxes are astronomically defined as either of the two moments in the year when the Sun is exactly above the equator (i.e. when the plane of the Earth’s equator passes the center of the Sun).

The Autumnal Equinox falls about September 23, as the Sun crosses the celestial equator going south.

Note :

The word “equinox” derives from the concept of equal day/night.

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