Yom Kippur is in full swing as Jews celebrate worldwide, 9-17

Jewish worshippers pray

Jewish worshippers pray at the Western Wall, Judaism's holiest prayer site, ahead of Yom Kippur in Jerusalem's Old City September 16th. Yom Kippur, or Day of Atonement, which starts at sundown Friday night, is the holiest of Jewish holidays when observant Jews atone for the sins of the past year.