The Brill Dictionary of Religion

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Islam: Festal Calendar
(198 words)

Due to the method of observation of the moon, the pure lunar calendar used by Muhammad, which determines the times of religious duties, etc. (e.g., fasting), is very inexact. Accordingly, even in Islamic antiquity, additional months of twenty-nine and thirty days were introduced. This device occasions a shift vis-à-vis the solar calendar. In parallel with the Islamic lunar year, other calendars were used from the outset, such as that of Yazdegird (Iran, 365 days…

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Imhof, Agnes, “Islam: Festal Calendar”, in: The Brill Dictionary of Religion, Edited by Kocku von Stuckrad. Consulted online on 05 March 2021 <>
First published online: 2006
First print edition: ISBN: 9789004124332, 20051223

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