Saudi Arabia announced the start of the holy month of Ramazan on Monday.
The announcement comes after the sighting of the crescent by the moon-sighting committee.
This crescent sighting marks the beginning of the month in the Islamic Hijri calendar.
According to the Saudi Supreme Court, the crescent was spotted on Sunday evening, which also marks the last day of Sha'ban month.
United Arab Emirates (UAE) and Qatar too also announced that Monday will be the first day of Ramzan.
Ramazan is determined by the Islamic lunar calendar, which begins with the sighting of the crescent moon.
Saudi Arabia and other Muslim-majority countries rely on the testimonies of moon sighters to determine the start of the month.
For the moon to be visible, the crescent must set after the sun. This allows the sky to be dark enough to spot the small slither of the new moon.