Saudi Royal Court announced after the crescent moon was spotted at Sudair and Tamir observatories in the Kingdom.
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The UAE and Qatar have also announced Sunday as the first day of Eid al-Fitr.
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The sighting committees began the process of investigating the sighting of the Eid Al-Fitr crescent at sunset in Saudi Arabia.
In an official announcement, the Supreme Court earlier this week called on anyone who sights the moon—either with the naked eye or using binoculars—to report their observation to the nearest court and register their testimony.