Radkan Astronomical Tower

Radkan astronomical tower which was established in 660 Hejri = 640 Khorsidi = 1261 A.D. by Khajeh Nasir Tusi.This tower is located in Tus plain which has been invaded by industrial sites.Over the past two decades.Overly bright and garish lighting has so polluted the nighttime in this ancient site.Sadly, tower of Radkan is losing its view of the night sky after 700 years.