1) The Book of Fixed Stars (كتاب صور الكواكب) is an astronomical text written by Abd al-Rahman al-Sufi (Azophi) around 964. The book was written in Arabic, the common language for scholars across the vast Islamic territories, although the author himself was Persian...1/4
#fact
#fact
2) Al-Sufi improved upon Ptolemy’s system. Instead of two brightness categories (‘more bright’ and ‘less bright’), Al-Sufi employed three: (‘less’) (‘greater’), and (‘much-greater’). Ihsan Hafez has recorded 132 stars in Al-Sufi’s work not mentioned by Ptolemy..2/4
#science
#science
3) Al-Sufi's results, as in Ptolemy's Almagest, were set out constellation by constellation. For each constellation, he provided two drawings, one from the outside of a celestial globe, and the other from the inside. ..3/4
#astronomie #science #fact #History
#astronomie #science #fact #History
4) The work was highly influential and survives in numerous manuscripts and translations. The oldest manuscript, kept in the Bodleian Library, dates to 1009 and is the work of the author's son. There is a thirteenth-century copy in the British Library...4/4
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