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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 ...
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