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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. |
about
Age: 24y
1103
Age: 24y
birth of childAénor of Châtellerault 1 Source ⇓ |
| 1103 • The great flood of Goa leaves thousands cut off from the war-torn city of Ohpen Bheta. |
1151
Jul 7
Age: 72y
| 1151 • Confronted with internal strife, the commune of Bologna is the first Italian republic to turn to the rule of a podestà, Guido di Ranieri da Sasso (ends in 1155). |