MUHAMMADIYAH.OR.ID, YOGYAKARTA—Muhammadiyah calculations reveal that Friday, April 21, is the first day of Eid al-Fitr.
On Thursday, April 20 or Ramadan 29, 1444 H, the conjunction prior to Shawwal occurs at 11:15:06 Western Indonesian Time.
On that particular day, the moon is above the horizon throughout all of Indonesia at sunset, with an altitude of +01° 47′ 58″ in Yogyakarta, indicating that the crescent moon appears.
The altitude of the crescent moon in areas east of Yogyakarta, such as Makassar and Papua, is lower. Meanwhile, areas west of Yogyakarta, such as Jakarta, Aceh, and Saudi Arabia, have a higher altitude of the crescent moon. As we move to the west, the higher the altitude of the crescent moon.