When Is The Autumnal Equinox 2024. The vernal equinox marks the beginning of. Autumnal equinox is the moment in which the sun enters libra.
An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length. The dates for equinoxes and solstices in the northern and southern hemispheres are the same, but in opposite seasons.
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