Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. Contains a default catalogue of over 80,000 deep-sky objects, extra catalogue with more than 1 million deep-sky objects, and an extra catalogues with more than 177 million stars.
SGE provides an artificial star for astrophotographers to test autoguiding.
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