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.
default catalogue of over 600,000 stars,
extra catalogues with more than 210 million stars,
asterisms and illustrations of the constellations,
constellations for twelve different cultures,
images of nebulae (full Messier catalogue),
realistic Milky Way,
very realistic atmosphere,