Vernal Equinox 2024 Date Chart. W hile meteorologists like to call fall at the beginning of september, astronomical autumn starts later, on the autumnal equinox.this year, it falls on sunday, sept. The vernal equinox โ is an astronomical phenomenon when the sun, in its visible motion along the ecliptic, crosses the celestial equator.
Vernal equinox, two moments in the year when the sun is exactly above the equator and day and night are of equal length; The northern vernal equinox (that is, the vernal equinox in the northern hemisphere) occurs around march 21st of each year, and the northern autumnal equinox occurs around.
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