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‘Umar al-Khayyam (Omar Khayyam)
‘Umar al-Khayyam (better known as Omar Khayyam, 1048-1123...
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Glances on Calendars and Almanacs in the Islamic Civilization
From the beginning of the Islamic history, the scholars...
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Using an Astrolabe
The history of the astrolabe begins more than two thousand...
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