jan 1, 1250 - Nasir al-Sin al-Tusi
Description:
The work of Nasir al-Din al-Tusi, Treatise on the Secrets of the Sector Figure, is the first treatment of trigonometry in its own right, as a complete subject apart from astronomy. He attempts to develop a form of non-Euclidean geometryAdded to timeline:
Date:
jan 1, 1250
Now
~ 775 years ago