Muslim men arrange a theodolite to look at the position of the moon, to mark the first day of the holy month of Ramadan at Al-Musyari'in mosque in Jakarta, Indonesia, May 5, 2019.

Members of Pakistan's moon sighting committee perform evening prayers after they tried to look for the new moon that will mark the start of the holy month of Ramadan, from Pakistan's Meteorological Department (PMD) building in Karachi, Pakistan May 5, 2019. REUTERS/Akhtar Soomro

Staff members of the Pakistan's Meteorological Department (PMD) gesture as they adjust a telescope for the new moon sighting that will mark the start of the holy month of Ramadan, in Karachi, Pakistan May 5, 2019.

Members of the moon sighting committee use telescope to see the new moon that will mark the start of the holy month of Ramadan, from Pakistan's Meteorological Department (PMD) building in Karachi, Pakistan May 5, 2019.

A man is silhouetted against the setting sun as he adjusts a theodolite to look for the new moon that will mark the start of the holy month of Ramadan, from Pakistan's Meteorological Department (PMD) building in Karachi, Pakistan May 5, 2019.

Muslim man uses binoculars to look at the position of the moon, to mark the first day of the holy month of Ramadan at Al-Musyari'in mosque in Jakarta, Indonesia, May 5, 2019.

Members of the moon sighting committee gather and use telescope to see the new moon that will mark the start of the holy month of Ramadan, from Pakistan's Meteorological Department (PMD) building in Karachi, Pakistan May 5, 2019. REUTERS/Akhtar Soomro - RC116432ABC0