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The Book of Times
This is a manuscript copy of Kitāb al-Azmān (The book of times; also known as Kitāb al-Azmina) by Yuḥannā Ibn Māsawayh (died circa 857), the famous physician of the Abbasid era. The work belongs to the tradition of Islamic hemerology—the study of the calendar, especially with a view to discerning the auspiciousness of carrying out various actions at a given date or time. In his introduction, the author states: "The people of knowledge and philosophy and the physicians of Persia, India, and Rūm [Asia Minor], have said that the ...
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National Library and Archives of Egypt