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autumnal equinox — 1 page

Reference Harvest Moon 2026 date: September 26 at 12:49 p.m. ET, the same night Neptune reaches opposition The 2026 Harvest Moon falls on September 26, turning full at 12:49 p.m. ET. Neptune reaches opposition hours earlier, at 01:28 UTC on the 26th, which US sources list as September 25. Science · Sep 3