Today Google has marked Persian mathematician Omar Khayyam's 971st birth anniversary with a doodle. 

Omar Khayyam born on May 18, 1048 in Nishapur in north-east Iran. 

Also poet, philosopher and astronomer he is known for his work on cubic equations as well as his contribution to the parallel axiom. 

Asian Image:

Khayyam also contributed to the understanding of the parallel axiom.

As an astronomer, he designed the Jalali calendar, a solar calendar with a very precise 33-year intercalation cycle.