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English[en]
Omar Khayyam (18 May 1048 – 4 December 1131; Persian: عمر خیّام),[a] birth name Ghiyāth al-Dīn Abū al-Fatḥ ʿUmar ibn Ibrāhīm Nīsābūrī,[3][4] was a Persian polymath, mathematician, astronomer, historian, philosopher, and poet.[5][6][7][8] He was born in Nishapur, the initial capital of the Seljuk Empire. As a scholar, he was contemporary with the rule of the Seljuk dynasty around the time of the First Crusade. As a mathematician, he is most notable for his work on the classification and solution of cubic equations, where he provided geometric solutions by the intersection of conics.[9] Khayyam also contributed to the understanding of the parallel axiom.[10]: 284 As an astronomer, he designed the Jalali calendar, a solar calendar with a very precise 33-year intercalation cycle[11][12]: 659 that provided the basis for the Persian calendar that is still in use after nearly a millennium. In the 1000s in Persia, Khayyam announced in 1079, that the length of the year was measured as 365.24219858156 days.[13] Given that the length of the year is changing in the sixth decimal place over a person's lifetime, this is outstandingly accurate. For comparison the length of the year at the end of the 19th century was 365.242196 days, while today it is 365.242190 days.
Cornish[kw]
Omar Khayyám (1048–1123; yn persek, "عمر خیام") o bardh ha kalkor genys yn Nishapur, Iran. Y hanow leun o Ghiyath al-Din Abu'l-Fath Umar ibn Ibrahim Al-Nisaburi al-Khayyami. (Yma al-Khayyami ow styrya "gwrier tyldow"). Geryes da o Omar Khayyam yn bywnans y honan avel kalkor ha steronydh a wrug gwellheans dhe'n lyver-dydhyow persek. An Sodon Jalal ad-Din Malekshah Saljuqi a selyas an lyver-dydhyow dasfurvyes yn soedhogel 15 mis Meurth 1079. Mes an lyenn a skrifas Omar Khayyám yw aswonnys yn kwell hedhyw. Nebes mil gwersow a beswar linenn a skrifas ev. Treylyans Edward Fitzgerald (1809-1883) a'y Rubáiyát a wrug Omar Khayyám awtour a vri y'n bys ow kewsel sowsnek, rag ensompel. Yn 1990, Jowann Richards a dhyllas treylyans an Rubáiyát yn kernewek. Mes an lyenn a skrifas Omar Khayyám yw aswonnys yn kwell hedhyw. Nebes mil gwersow a beswar linenn a skrifas ev. Treylyans Edward Fitzgerald (1809-1883) a'y Rubáiyát a wrug Omar Khayyám awtour a vri y'n bys ow kewsel sowsnek, rag ensompel. Yn 1990, Jowann Richards a dhyllas treylyans an Rubáiyát yn kernewek