The autumnal equinox arrives on Monday, September 22, 2025, at 2:19 P.M. EDT, bringing with it the end of summer, the beginning of fall and the onset of Libra season.

Astronomically, an equinox occurs when the sun crosses the equator. The term combines the Latin word aequi, meaning “equal,” with nox, meaning “night,” as on this day of days, the hours of light and darkness are equal.

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Mythically, the autumnal equinox relates to the story of Persephone and marks the moment the goddess descends into the underworld to rejoin her husband, hell daddy Hades.

Astrologically, the fall equinox heralds the arrival of Libra season. Libra is the sign of the scales and partnership, meaning themes of balance and reflection, collection and release are nigh.

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