Jawharī: al-ҁAbbās ibn Saҁīd al-Jawharī
FlourishedBaghdad, (Iraq), 830
Jawharī made solar, lunar, and planetary observations in Baghdad from 829 to 830, the data of which appeared in the astronomical handbook with tables that is sometimes referred to as Kitāb al-Zīj. Most likely, this is a reference to the Mumtaḥan zīj, which was apparently jointly authored by several astronomers at the court of the ҁAbbāsid caliph Ma'mūn. Charged by the caliph with the task of providing appropriate instruments for the year-long series of astronomical observations at Damascus in 832–833, Jawharī selected Khālid ibn ҁ Abd al-Malik al-Marwarrūdhī to construct them. Jawharī also contributed to the accuracy of the calculated solar and lunar data; these results also appeared in the Mumtaḥan zīj. His astronomical writings were later consulted by Shams al-Dīn al- Samarqandī, a contemporary of Naṣīr al-Dīn al- Ṭūsī. In his work on the parallels postulate of Euclid, Ṭūsī noted the failure of Jawharī to prove the parallels postulate in the...
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