Timeline Saturday 15 March 1079

Events on Saturday 15 March 1079 3

• 1079 Jalali Calendar Introduced in the Seljuk Empire Omar Khayyam's commission reforms the Persian solar year Under the patronage of Seljuk sultan Malik-Shah I, a panel of astronomers including Omar Khayyam devised the Jalali calendar, a highly accurate solar calendar. Its epoch began at the spring equinox, and later Persian and Iranian calendars descended from its design.
• 1079 Jalali calendar introduced in Persia Omar Khayyam The Seljuk sultan Malik-Shah introduces a solar calendar worked out by astronomers including Omar Khayyam. It starts the year at the spring equinox and is more accurate than the Gregorian calendar adopted in Europe five centuries later.
• 1079 Omar Khayyam's Jalali calendar is inaugurated New solar calendar named after Sultan Jalal al-Din Malik-Shah The Jalali calendar, based on the work of Khayyam's team, was inaugurated on 15 March 1079. It was more accurate than the Julian calendar and is the basis of the modern Iranian calendar.