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The Book of Remedies from Deficiencies in Setting Up Marble Sundials
This work is a treatise for timekeepers (singular muwaqqit), and discusses the telling of time from such astronomical observations as the sun’s angle of inclination (mayl), altitude (irtifā‛), as well as the direction (samt) and length of cast shadows (zill). In 14 chapters, the author goes through methods for the computation of these factors, determination of the direction of prayer (qibla), and time of the day. He observes that using instruments (ālāt), such as markings on the ruler (mistara) and the compass (bargār, from the Persian pargār), and geometric ...
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