The Israeli weekend is observed on Friday and Saturday. Friday is the holy day for Muslims. Saturday, the Sabbath, is he holy day for Jews. The first day of the work week in Israel is Sunday. The Jewish Sabbath officially begins at sundown on Friday and ends Saturday evening when the first three stars appear in the sky. Many businesses close early on Fridays and remain closed through Saturday, including public transportation, kosher restaurants, some museums, and a few other tourist sites. Secular areas like Tel Aviv, non-Jewish businesses, and most national parks remain open on the Sabbath.