Stellarium
Open SourceStellarium is a free and open-source planetarium software that allows users to explore the night sky from the comfort of their computer. It displays a realistic 3D rendering of the celestial sphere, showing stars, constellations, planets, and other astronomical objects in accurate positions at any given time.
Key Features
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Highly realistic and accurate simulation of the night sky.
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Completely free and open-source with a strong community.
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Extensive features for observation and learning.