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1079
| 1079 • Persian astronomer, Omar Khayyám, computed the length of the year to be exactly 365.24219858156 days, the most accurate calculation of his time. Khayyam also, in Treatise on Demonstrations of Problems in Algebra, produced a complete classification of cubic equations and their geometric solutions. |
1118
May 1
Age: 39y
| 1118 • Sylvester of Kiev becomes bishop of Pereyaslav. |