Which equinox denotes an equal amount of daylight and night on March 21-22?

The equinox on March 21-22 is known as the Vernal Equinox. During this time, the tilt of Earth’s axis is such that the sun is positioned directly above the equator. This results in nearly equal amounts of daylight and nighttime across the globe. The term "vernal" signifies spring, marking the transition from winter to spring in the Northern Hemisphere.

This day is significant in many cultures as it often heralds the start of planting seasons and spring festivities. The balance of day and night is a defining characteristic of an equinox, and the Vernal Equinox specifically represents this balance as the sun moves from the Southern Hemisphere into the Northern Hemisphere.