Vernal Equinox
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<holidayfyi-glossary slug="vernal-equinox"></holidayfyi-glossary>The moment in spring when the Sun crosses the celestial equator and day and night are of approximately equal length, occurring around 20-21 March in the Northern Hemisphere and 22-23 September in the Southern Hemisphere. The vernal equinox underlies several major celebrations: Nowruz (Persian New Year) is celebrated precisely at the spring equinox, and the Christian dating of Easter is algorithmically linked to the first full moon after it, giving the equinox central importance in two of the world's largest religious calendars.