This work, by a timekeeper at the Al-Azhar Mosque in Cairo, is an important and comprehensive textbook on timekeeping. It introduces the useful device of dividing a quarter of a circle of projection into sections known as <em>almucantars</em> (<em>muqanṭarāt</em>). The work, comprising 100 folio pages, contains 30 chapters and a conclusion. The work was composed in 1440-1 (844 A.H.) and was copied in 1757 (1170 A.H.).
<br>Arabic manuscripts; Naskh script; Textbooks; Timekeeping
Sibṭ al-Māridīnī, Badr al-Dīn Muḥammad ibn Muḥammad, born 1423
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