The famous Iranian Islamic theologian and scientist, Khwaja Naseer od-Din Tousi
Compiled By: Syed Ali Shahbaz
On February 18, 1201 AD, the famous Iranian Islamic theologian and scientist, Mohammad ibn Hasan, known popularly as Khwaja Naseer od-Din Tousi, was born in the city of Tous, near the holy city of Mashhad in Khorasan, northeastern Iran. He was an outstanding philosopher, scientist, mathematician and astronomer who made valuable contributions to the development of science and civilization.
Even the Mongol invaders acknowledged his genius and Hulagu Khan, appointed him as his scientific advisor. Naseer od-Din Tousi built the famous observatory at Maragheh in 1262). It had various instruments such as a 4-meter wall quadrant made from copper and an azimuth quadrant which was his unique invention. Using accurately plotted planetary movements, he modified Ptolemy's model of the planetary system based on mechanical principles.
The observatory and its library became a centre for a wide range of work in science, mathematics and philosophy. He wrote several books on theology, ethics, philosophy, mathematics, science, astronomy etc. Naseer od-Din Tousi died in Iraq and was laid to rest in the holy mausoleum of Imam Musa al-Kazem (AS), the 7th Infallible Successor of Prophet Mohammad (SAWA).