نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری تاریخ علم دورۀ اسلامی، پژوهشکدۀ تاریخ علم، دانشگاه تهران
2 پژوهشکده تاریخ علم، دانشگاه تهران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Astronomical works from the Islamic era include various methods for determining the Qibla direction of cities. Among these are techniques for finding the Qibla when its angular deviation is known, using the sun. Some astrolabes even feature diagrams on their reverse side that indicate the Qibla direction based on the sun’s altitude. Notably, Ibn Yunus describes a method that determines the Qibla by calculating the time elapsed since sunrise. Certain sundials have also been discovered that mark the time since sunrise rather than the local equinoctial hour. Building on these established premises, this article investigates a treatise that presents a previously undocumented method for determining the Qibla direction, attributed to Muḥammad Bāqir Yazdī, a distinguished mathematician of the Safavid era. According to the treatise, Yazdī claimed that the city of Isfahan possesses a unique property: after a fixed interval following sunrise, the sun aligns with the Qibla direction. While the author of the treatise offers a proof of this claim, he does not explain how the interval is calculated. Moreover, different manuscript versions report varying values for this interval. We perform the necessary astronomical calculations to evaluate these claims and demonstrate that the reported intervals deviate by more than one hour from the correct value, making it impossible to determine which value Yazdī originally intended.
کلیدواژهها [English]
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