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.

Saudi Arabia has officially announced that Ramadan will begin on Saturday, March 1, with the sighting of the crescent moon. Muslims throughout the Kingdom and beyond will fast from dawn to dusk, devoting the month to spiritual development,

However, unlike other religious holidays, Ramadan doesn't start on the same day each year. This is because the Islamic calendar follows the moon's cycle. And what can be even more confusing is that different groups might give slightly different dates for when Ramadan starts,