Autumnal Equinox
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The astronomical moment in autumn when the Sun crosses the celestial equator, resulting in roughly equal day and night, occurring around 22-23 September in the Northern Hemisphere and 20-21 March in the Southern. In Japan the autumnal equinox is a national holiday (Shubun no Hi) dedicated to ancestor veneration, and harvest festivals across many cultures coincide with it — including Mid-Autumn Festival in East Asia, the German Erntedankfest, and Sukkot in the Jewish calendar — all celebrating abundance before winter.