Observatory of Khawja Nasir ad-Din Tusi possibly found in Iran

Archaeologists from the Alamut Castle Research Center in Iran believe they might have discovered the 13th century observatory of polymath Khawja Nasir ad-Din Tusi, who accepted the position of scientific advisor to the Mongols in 1256.

A Persian philosopher, scientist, and mathematician, Khawja Nasir ad-Din Tusi (1201-1274), spent 26 years at Alamut and other castles, long enough, experts believe, to construct the observatory at the mountain castle.