Omar Khayyám

The man known in English as the Persian poet Omar Khayyám (May 18 1048 - December 4 1123, assumed dates) was born in Nishapur (or Naishapur) in Khorasan, Persia (Iran), and named Ghiyath al-Din Abu'l-Fath Umar ibn Ibrahim Al-Nisaburi al-Khayyami (al-Khayyami means "the tentmaker"). His name in Persian is "??? ????".

Omar Khayyam the mathematician

He was famous during his lifetime as a mathematician and astronomer who calculated how to correct the Persian calendar. On March 15, 1079, Sultan Jalal al-Din Malekshah Saljuqi (1072-1092) put Omar's corrected calendar into effect, as in Europe Julius Caesar had done in 46 B.C. with the corrections of Sosigenes, and as Pope Gregory XIII would do in February 1552 with Aloysius Lilius' corrected calendar (although Britain would not switch from the Julian to the Gregorian calendar until 1751, and Russia would not switch until 1918).

Related Topics:
Mathematician - Astronomer - Persian calendar - March 15 - 1079 - Sultan Jalal al-Din Malekshah Saljuqi - Europe - Julius Caesar - Sosigenes - Pope Gregory XIII - Aloysius Lilius - Britain - Julian - Gregorian calendar - Russia

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

He is also well known for inventing the method of solving cubic equations by intersecting a parabola with a circle.

Related Topics:
Cubic equation - Parabola - Circle

~ ~ ~ ~ ~ ~ ~ ~ ~ ~