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Shemini Atzeret (שְׁמִינִי עֲצֶרֶת—"Eighth [day] of Assembly") is a Jewish holiday. It is celebrated on the 22nd day of the Hebrew month of Tishrei, which usually coincides with late September or early October. It directly follows the festival of Sukkot, which is celebrated for seven days; thus, Shemini Atzeret is literally the eighth day [of assembly]. It is a separate—yet connected—holy day devoted to the spiritual aspects of the festival of Sukkot. Part of its duality as a holy day is that it is simultaneously considered connected to Sukkot and a separate festival in its own right.
Shmini Atzeret is observed in Judaism. The summary above comes from Wikipedia, where you can read about the history and traditions of this observance.
Shmini Atzeret falls on Saturday, October 03, 2026. The countdown above updates live, so you always see exactly how many days, hours, and minutes are left.