The three-day festival celebrates the completion of Ramadan by Muslims across the world.
As the fasting month of Ramadan comes to an end, Muslims from around the world will be preparing for Eid al-Fitr, the “festival of breaking the fast”.
Depending on the sighting of the moon, Eid celebrations will most likely begin on Saturday, April 22, depending on where you are in the world.
Lunar months last between 29 and 30 days so Muslims usually have to wait until the night before Eid to verify its date.
Countries that started Ramadan on March 23, will have their local moon sighters scan the horizon after sunset for the crescent moon on Thursday, April 20.
If the new moon is visible, then the next day will be Eid, if not, Muslims will then fast one more day to complete a 30-day month.
When the sighting has been verified, Eid is declared on television, radio stations and at mosques.
According to the United Kingdom’s HM Nautical Almanac Office, the birth of the new Moon will be visible at 04:13 GMT on Thursday, April 20, but will only be visible under certain conditions across North America.
However, the overwhelming majority of the world should be able to easily see the new Moon with the naked eye the following night, Friday, April 21, meaning the first day of Eid will be Saturday, April 22.