Radkan astronomical tower and summer night sky

Radkan is an astronomical tower made by khaje nasir tousi in almost 700 years ago. It's height is about 25 meters. This tower has a lot of usage, e.g. you can determine the exactly date of the equinoxes and solstices with sunshine gleam that comes in to the tower through little gates. This tower was also an observatory but unfortunately during long time some parts of it had destroyed. This is a view from radkan tower and summer night sky.