Yom Kippur and ‘Ashura

This year, like last, both the Jewish and Muslim New Years coincided. And since each tradition marks the tenth day of the New Year, the observation of Yom Kippur and ‘Ashura also  coincide.

Though Sunni Muslims do acknowledge ‘Ashura as the tenth day of the new year, it is of central importance to Shi‘ite Muslims, marking the martyrdom of Imam Hussein, the Third Imam, at the Battle of Karbala'

Both observances began at sundown.