The Office of the Supreme Leader

Criterion for determining the beginning of Ramadan

Q: Are the beginning and end of Ramadan determined through sighting the crescent or by means of the calendar, even if Sha‘bān was not thirty days?  
A: Deciding the beginning of any lunar month is possible through one of the following methods: sighting the new moon by the mukallaf himself; the testimony of two just witnesses to that effect; numerous reports that bring conviction that the moon has been sighted; completion of thirty days since the month’s beginning; or the decree of a religious authority.
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