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Scientific Tools
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Stellarium
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.
Astropy Project
The Astropy Project is a community effort to develop a common core package for Astronomy in Python and foster an ecosystem of interoperable astronomy packages.
Astronomy.tools
Welcome to astronomy.tools a collection of useful, free astronomy tools.