At precisely March 20, 11:06 PM EDT, the Northern Hemisphere will be celebrating spring equinox 2024. On this date, day and night reach nearly equal duration worldwide as the sun crosses the celestial equator going northward.
The equinox timing qualifies as the earliest in 124 years. It initiates the reversal of waning daylight across the global north.
What's in a Name?
The equinox derives its name from the Latin for “equal night” based on the sun’s position above the equator.
From this point forward through the summer solstice in June, days lengthen more than nights. The opposite holds for south of the equator—with earlier sunsets, longer darkness—as fall and winter approach there.