The Sun is directly overhead at the Equator and the entire Earth has 12 hours of day and night. The Sun rises directly in the east and sets directly in the west. So, it was near the equator at noon on 21 March.
Northern Hemisphere is the the vernal equinox falls about March 20 or 21, as the Sun crosses the celestial equator to the north. Southern Hemisphere is the equinox occurs on September 22 or 23 when the Sun moves south across the celestial equator.
On the basis of geographically, 21st March is very important because it was marking the beginning of spring seasons the sun will cross the planet of the earth's equator & making day and night of approximately the same duration this events is known as equinox.
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