Ode of Omar Khayyam

The poet Omar Khayyam left many athletic and intellectual آثار, and it is mentioned that he left a wonderful athletic heritage; this heritage is represented in determining the calendar for Sultan Malik-Shah bin Alp Arslan Seljuk, and this calendar has become followed in Iran until now, as well as he devised a method for calculating trigonometry, and invented some third-degree mathematical equations in algebra.