🔰 Radkan tower is a 13th-century tower near Chenaran in Razavi Khorasan province, Iran
The inscription on the tower indicates that the tower was constructed in year 660 of the Lunar Hijri calendar, roughly equal to 1262 CE. This corresponds with the date of the construction of Maragheh observatory, suggesting that they are related and the tower has had uses in astronomy.
This conical tower with height of 25 meters’ dates back to 13th century during Mongols invasions. Mil-e Radkan was a structure which helped residents determine the beginning of the four seasons, leap years and Nowruz.
Shape of the tower is like a cone. Internal diameter of tower is 14 and external diameter is 20 meters. The tower has dodecagon walls which are precisely constructed.
During 12th century, it was the first tower demonstrating the seasons and new year. Here was designed by Nasir ad-Din al-Tusi. The doors of the tower have set the base on situation of sunrise and it was the way to show the seasons. The tower also was used for astronomy. Date of construction, descriptions and some texts about designer are carved at the top of it on the stone. Materials used for building the tower are brick, lime, plaster and clay.
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