O. Khayyam:
Like most Persian mathematicians of the period, Omar Khayyám was also famous as an astronomer. In 1073, the Seljuk Sultan Sultan Jalal al-Din Malekshah Saljuqi (Malik-Shah I, 1072-92), invited Khayyám to build an observatory, along with various other distinguished scientists. One being Shamse Tabrizi, his mentor and the father of Kimia Khatoon,who he fell in love with. Eventually, Khayyám and his colleagues measured the length of the solar year as 365.2425 days. Omar's calendar was more accurate than 500 years later the Gregorian calendar. The modern Iranian calendar is based on his calculations
http://en.wikipedia.org/wiki/Omar_Khayyám
Like most Persian mathematicians of the period, Omar Khayyám was also famous as an astronomer. In 1073, the Seljuk Sultan Sultan Jalal al-Din Malekshah Saljuqi (Malik-Shah I, 1072-92), invited Khayyám to build an observatory, along with various other distinguished scientists. One being Shamse Tabrizi, his mentor and the father of Kimia Khatoon,who he fell in love with. Eventually, Khayyám and his colleagues measured the length of the solar year as 365.2425 days. Omar's calendar was more accurate than 500 years later the Gregorian calendar. The modern Iranian calendar is based on his calculations
http://en.wikipedia.org/wiki/Omar_Khayyám
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