Planetarium is described as 'A browser-based virtual planetarium of stars and planets customizable by location (latitude and longitude) and time of day' and is a Star Map in the education & reference category. There are more than 50 alternatives to Planetarium, not only websites but also apps for a variety of platforms, including iPhone, iPad, Android, Windows and Android Tablet apps. The best Planetarium alternative is Google Earth. It's not free, so if you're looking for a free alternative, you could try Google Earth or Stellarium. Other great sites and apps similar to Planetarium are Sky Map, KStars, Astrarium and NASA World Wind.
Explore Earth from space to sea with detailed satellite imagery, 3D buildings, and ad-free service. Save toured places, share them, and explore offline all points of interest around the globe.
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.
Celestia is an application for real-time 3D visualization of space, with a detailed model of the solar system, over 100,000 stars, more than 10,000 galaxies, and an extension mechanism for adding more objects.
Sky Map (formerly the Google Sky Map) turns your Android-powered mobile phone into a window on the night sky.
Open-source astronomy software offering accurate night sky simulation with 100 million stars, Ekos astrophotography suite, stellar observation planner, "What's up Tonight" tool, FOV editor, and a variety of celestial catalogs for comprehensive astronomical exploration.
Astrarium is a free and open source desktop planetarium software for Windows. It allows to discover night sky as seen from any point on the Earth and any date and time instant. There are many celestial objects can be observed, from eight major planets to faintest stars...
World Wind lets you zoom from satellite altitude into any place on Earth. Leveraging Landsat satellite imagery and Shuttle Radar Topography Mission data, World Wind lets you experience Earth terrain in visually rich 3D, just as if you were really there.
3D simulation of the Solar System and night sky - real time virtual orrery and observatory
Planetario contains a 3D model of our solar system. It will show the horizon and the planets in their path along the sky. The word planet comes from the Greek planetai, meaning "wanderers". Because of the rotation of the earth, the stars seem to move in perfect...
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It's downloadable on Linux, so it can be used offline.