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.

Features:

sky
• 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, sunrise and sunset
• the planets and their satellites

interface
• a powerful zoom
• time control
• multilingual interface
• fisheye projection for planetarium domes
• spheric mirror projection for your own low-cost dome
• all new graphical interface and extensive keyboard control
• telescope control

visualisation
• equatorial and azimuthal grids
• star twinkling
• shooting stars
• eclipse simulation
• skinnable landscapes, now with spheric panorama projection

customizability
• plugin system adding artifical satellites, ocular simulation, telescope • configuration and more
• ability to add new solar system objects from online resources...
• add your own deep sky objects, landscapes, constellation images, scripts...

Requirements:
macOS 10.12+
3D graphics card which supports OpenGL 3.0 and GLSL 1.3
64-bit Intel