Used Astrolabium for Windows?
Developer’s Description
By Thomas Bach
AstroLabium is used for Astronomy. You can determine the distance (as angle) between objects on astrophotos, e.g. double stars. You can also measure the diameter of planets, comets and Messier nebulae as well as the absolute diameter of moon craters. Just enter which camera and focus length was used for the photo. Then select two points and the result will be displayed.
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