The Length of a Day

بِسۡمِ ٱللهِ ٱلرَّحۡمَـٰنِ ٱلرَّحِيمِ

Shaykh Abu al-Fath Ghiyats ad-Din ‘Umar ibn Ibrahim al-Khayyami an-Nishaburi (q,s,) was the teacher of Shaykh Farid ad-Din ‘Aththar Abu Ḥamid ibn Abu Bakr Ibrahim (q.s.), the author of Manthiq ath-Thayr and other works.  In 1079, Shaykh ‘Umar al-Khayyam (q,s,) calculated the exact length of the year.  Modern science has since discovered that his calculation was off by 0.09 seconds.



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