Ramadan is not uniformly observed globally — the start date can vary by country or even be different mosque to mosque in the same city for a variety of reasons. But it all starts with a sighting of the crescent moon.

February 28 marks the 29th of Shaban. If the moon is sighted today, the first Roza will be on March 1; otherwise, fasting will begin on March 2.

Muslims prepare for Ramadan, a month of fasting, prayer, and reflection, starting at sunset Friday and ending March 30. Follow Newsweek's live blog.