The word "Equinox" is derived from the Latin aequinoctium, from aequus (equal) and nox (genitive noctis) (night).

An equinox is commonly regarded as the instant of time when the plane of Earth's equator passes through the center of the Sun.
This occurs twice each year, around 20 March and 23 September.

It is the moment at which the center of the visible Sun is directly above the Equator. In the northern hemisphere, the equinox in March is called the Vernal or Spring Equinox. The September equinox is called the Autumnal or Fall Equinox. On the day of an equinox, daytime and nighttime nearly equal.

Google welcomes the first day of the Spring with doodle on 20, March 2019.


https://www.youtube.com/watch?v=fbts7n4lH7o