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Calendrical Calculations, Third Edition by Edward M. Reingold, Nachum Dershowitz

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        Page containing a discussion of months in the pre-Islamic Arab, Hebrew, Islamic, and Hindu calendars, along with an illustration of Mohammed instituting the purely lunar calendar. From a seventeenth-century copy of an illuminated fourteenth-century manuscript of the eleventh-century work Al-Āthār al-Bāqiyah ‘an al-Qurūn al-Khāliyah by the great Persian scholar and scientist Abū-Raiān Muammad ibn ’Amad al-Bīrūnī. (Courtesy of Bibliothèque Nationale de France, Paris.)

6The Islamic Calendar

The number of months with God is twelve in accordance with God’s law since the day he created the heavens and the Earth.… Intercalating a month ...

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