Die Deepsky-Datenbank ist ein frei verwendbares Tool zum Vorbereiten der Beobachtungsnacht. Angemeldete Benutzer können Beobachtungsplaner speichern und mit anderen austauschen.
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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.
It is being used in planetarium projectors. Just set your coordinates and go.