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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 ...
The Book of the Table Regarding the Knowledge of the Time and the Heavens for the Calculation of the Beginning of the Islamic and Christian Months
Because of the religious obligation to perform canonical prayers at set times of the day and the sanctity attributed to particular times of the year, such as the month of Ramaḍān, Muslim scientists have studied questions relating to the calendar and the reckoning of time almost since the beginning of Islam. The present manuscript presents tables for the comparison of the Hijrī and Christian years. Little is known of the author of these tables, al-Ḥusayn ibn Zayd ibn ‘Alī ibn Jaḥḥāf, beyond a marginal note, which states that Ibn Jaḥḥāf ...