Tomorrow is the Vernal Equinox, or "Equal Night" - or what many note as the first day of Spring. The days will start to get longer after this, and the nights shorter. Because the sun will pass directly over the equator, days and nights will be of equal length all over the world during equinoxes. The official date of Easter is designated as the first Sunday after the first full moon after the vernal equinox.
Spring Equinox
Introduction to Astronomy - Vernal Equinox
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