Photo: The painting is a detail of “Jews Praying in the Synagogue on Yom Kippur” by the 22-year-old Maurycy Gottlieb c. 1878.

Yom Kippur, also known as Day of Atonement, is the holiest day of the year for the Jews.

Yom Kippur begins at sundown on Wednesday, Sept. 15 and concludes a few hours after sunset on Thursday, Sept. 16.

The day’s central themes are atonement and repentance. Jews traditionally observe this period with a 25-hour period of fasting and intensive prayer, often spending most of the day in synagogue services. Yom Kippur completes the annual period known in Judaism as the High Holy Days (the Days of Awe) that includes Rosh Hashanah, the New Year celebration.

High School athletic events and after-school activities at Belmont High School are typically curtailed for the holiday.