Astronomically… Eid Al-Adha will take place on this day

International Astronomy Center: Most of the Islamic world countries will observe the crescent of Dhu al-Hijjah on Sunday, June 18, as seeing the crescent will possible with difficulty using a telescope from the center and west of the Islamic world.

It is therefore expected that Monday, June 19 will mark the beginning of Dhu al-Hijjah in many countries, Tuesday, June 27, will be Arafah Day, and Wednesday, June 28 is the first day of Eid Al-Adha.