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 an website in the Education & Reference category. There are more than 25 alternatives to Planetarium, not only websites but also apps for a variety of platforms, including iPhone, iPad, Windows, Android and Android Tablet. The best alternative is Google Earth. It's not free, so if you're looking for a free alternative, you could try Stellarium or Celestia. Other great sites and apps similar to Planetarium are Sky Map (Free, Open Source), NASA World Wind (Free, Open Source), Gaia Sky (Free, Open Source) and KStars (Free, Open Source).
Google Earth lets you fly anywhere on Earth to view satellite imagery, maps, terrain, 3D buildings, from galaxies in outer space to the canyons of the ocean. You can explore rich geographical content, save your toured places, and share with others.
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.
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Stellarium vs Planetarium opinions
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It's downloadable on Linux, so it can be used offline.
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.
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 Features: - Heliocentric view with real-time positions of planets and planetary orbits - Schematic and realistic sizes of the planets and distances between them - Movement of the...