In Islam, time measurement is crucial to establishing, across the seasons and latitudes, the hours of the five daily prayers, the beginning and end of daily fasting during the month of Ramadan, and the period of Hajj, the month-long pilgrimage to Mecca.The Muslim calendar is lunar, consisting of 12 months of 29 and 30 days, totalling a 354-day year, hence the time-lag between the two sacred months.In the 11th century, Arab mathematicians introduced to Europe the use of zero and the decimal system originating from the Indians.
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