1048 – He was born on the 31st day of May this year in Iran, Persia. He spent his childhood in the town of Balhi, studying there and being tutored by Sheik Muhammad Mansuri, one of the most well known scholars of the time.
1070 – He wrote his greatest work on algebra. In it he classified equations according to their degree, and gave rules for solving quadratic equations, which are very similar to the ones in use today, and a geometric method for solving cubic equations with real roots.
1073 – Malik-Shah, sultan of Seljuk, invited him to build and work with an observatory, along with various other distinguished scientists. Eventually, he very accurately (correct to six decimal places) measured the length of the solar year as 365.24219858156 days.
1077 – He wrote Sharh ma ashkala min musadarat kitab Uqlidis (Explanations of the Difficulties in the Postulates of Euclid). An important part of the book is concerned with Euclid's famous parallel postulate, which had also attracted the interest of Thabit ibn Qurra.
1079 – Sultan Jalal al-Din Malekshah Saljuqi put Omar's corrected calendar into effect, as in Europe Julius Caesar had done in 46 B.C. with the corrections of Sosigenes.
1131 – The author who was popular for his “The Rubaiyat”, died on the 4th day of December this year.
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