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The Removal of the Veil in the Description of the Quadrants
This manuscript in 12 folios is a mid-18th-century copy of Kašf al-Qinā‘ fī rasm al-arbā‘ (The removal of the veil in the description of the quadrants), a treatise devoted to the description of the astronomical instrument known as the quadrant. The treatise originally was compiled by Muḥammad ibn Muḥammad Ibn al-Aṭṭar in the first half of the 15th century on the basis of the teachings of his predecessors, al-Mājidī and Nūr al-Dīn al-Naqāš. The treatise is a precious source for understanding the degree of refinement reached by astronomical instrument making ...
The Book of the Hyacinths in the Knowledge of the Dates of the Year
Little is known about the author of the present work, al-Ḥusayn ibn Zayd ibn ʻAlī Ibn Jaḥḥāf, apart from what can be inferred from the brief dedicatory note at the beginning of the present manuscript. It states that the work was composed for the Faṭimid caliph al-Ḥākim bi-ʼAmr Allāh, who died during the first quarter of the 11th century. The Kitāb al-Yawāqīt fī maʻrifat al-mawāqīt (The book of the hyacinths in the knowledge of the dates of the year) is composed of 12 calendrical ...