Yom Kippur, Day of Atonement has begun. This high holy day for our Jewish brothers and sisters began at sunset tonight and goes until sunset tomorrow. It is a 25 hour fast. Much of the time is spent in the synagogue.
Yom Kippur occurs on the 10th day of Tishri. See Leviticus 23:26ff. Yom Kippur is a Sabbath day, meaning no work.
In Orthodox synagogues, services begin early in the morning (8 or 9 AM) and continue until about 3 PM. People then usually go home for an afternoon nap and return around 5 or 6 PM for the afternoon and evening services, which continue until nightfall. The services end at nightfall, with the blowing of the tekiah gedolah, a long blast on the shofar.
It is customary to wear white on the holiday, which symbolizes purity and calls to mind the promise that our sins shall be made as white as snow (Is. 1:18).