Yom Kippur is a Jewish holiday known as the Day of Atonement, which is observed with a 25-hour period of fasting and intensive prayer, often spending most of the day in synagogue services. In 2023, Yom Kippur will occur from sunset on Sunday, September 24, until sundown on Monday, September 25. It is a state public holiday, and state government offices are closed. Some schools and businesses may also be closed on this day. Many Jewish-run organizations in the US are closed during the celebration of Rosh Hashanah, which is the Jewish New Year, but it is not a public holiday.