The start of Ramadan is determined by the sighting of the waxing crescent moon. Some Muslim communities use astronomical calculations, while others require visual confirmation of the waxing crescent moon to determine the beginning of the month. Months on the Islamic calendar, including Ramadan, last 29 or 30 days. Because the Islamic calendar year is overall shorter than the Gregorian calendar year, Ramadan begins 10β12 days earlier each year, allowing it to fall in every season throughout a 33-year cycle.
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