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| | The Islamic World to 1600: The Arts, Learning, and Knowledge (Omar Khayyam) (Site not responding. Last check: 2007-10-07) |
 | | Born Ghiyath al-Din Abul Fatah Umar Ibn Ibrahim al-Khayyam in 1044 in Nishapur, a Persian city, Omar Khayyam was a well-known mathematician, astronomer, philosopher, and poet. |
 | | Khayyam's calendar, called Al-Tarikh-al-Jalali after the sultan, was even more accurate than the Gregorian calendar presently used in most of the world: the Jalali calendar had an error of one day in 3770 years, while the Gregorian had an error of one day in 3330 years. |
 | | Khayyam's legacy remains largely in science, however, with his work in geometry so far ahead of its time that it was not used again until René Descartes built upon Khayyam's theories in 17th century France. |
| www.ucalgary.ca /applied_history/tutor/islam/learning/khayyam.html (439 words) |
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