According to the United Kingdom’s HM Nautical Almanac Office, the new moon will arrive at 20:28 GMT on Saturday, April 30 but a worldwide sighting will not be visible on that night.
Most of the world will be able to observe the crescent Moon with ease the following night, Sunday, May 1
Traditionally, Eid is celebrated for three days in all Muslim-majority countries.
However, the number of holiday days varies by country.
Muslims begin Eid day celebrations by partaking in the prayer service that takes place shortly after dawn, followed by a short sermon.
On their way to the prayer, which is traditionally held in an open area, Muslims recite takbeerat, praising God by saying “Allahu Akbar”, meaning “God is great”.
It is customary to eat something sweet prior to the prayer such as date-filled biscuits known as maamoul.
People congratulate one another as they head home after Eid prayers. They spend the day visiting relatives and neighbours, and accepting sweets as they move around from house to house.
Each country has traditional desserts and sweets that are prepared before Eid or on the morning of the first day. These foods range from special biscuits and bread to cakes and puddings.
Children, dressed in new clothes, are offered gifts and money to celebrate the joyous occasion.
In some countries, families visit graveyards to offer their respects to departed family members.
It is common for the capitals of Muslim-majority countries to decorate their cities with lights and hold festivities to commemorate the end of Ramadan.