Some Arab and Muslim countries and Muslim minorities in other countries will celebrate Eid al-Adha on Monday, unlike the vast majority of Arab and Islamic countries, due to the difference in the methods of observing the people, and therefore not all countries of the world agreed on a single beginning of the month of Dhul-Hijjah.
Muslims in Oman, Morocco, Iran, Pakistan, Mauritania and Nigeria will celebrate Eid al-Adha tomorrow. Shiites in Iraq will celebrate Eid on Monday after Sunnis celebrated in the country today, as well as Lebanon.
Eid al-Adha will arrive in Sri Lanka's Muslim minority tomorrow.
This difference also occurred in the celebration of Eid al-Fitr in early June, while the majority of Arab and Muslim countries celebrated Eid al-Fitr on Tuesday, 4 June, other countries announced the Eid the following day (5 June).
It is noteworthy that the Arab and Islamic countries themselves are investigating the vision of the parents to know the beginnings of the Hijri months, in contrast, the Muslim minorities in a number of countries in the world rely on Saudi Arabia in its vision of the crescent.