TEHRAN (Tasnim) - The glorious Eid al-Fitr prayer was led by Leader of the Islamic Revolution Ayatollah Seyed Ali Khamenei at the Grand Musallah of Tehran on Monday, March 31. - Society/Culture news - The gates of the Grand Musalla of Tehran opened at 4 am, while the celebratory programs at the site started at 6:30 am.The Eid prayer and sermons by the Leader of the Islamic Revolution started at 8 am.Eid-al-Fitr marks the end of the holy month of Ramadan in the Islamic calendar.Each year, the exact date of Eid is determined by the religious authorities after observing the new lunar month’s crescent moon.Eid al-Fitr has a particular Salat (Islamic prayer) which is generally offered in an open field or a large hall with a congregation in attendance.Muslims believe that they are commanded by God, as mentioned in Quran, to continue their fast until the last day of Ramadan and pay the Zakat al-Fitr -a ritual offering- before saying the Eid prayers.