Celestia is described as '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' and is a very popular Star Map in the education & reference category. There are more than 25 alternatives to Celestia for a variety of platforms, including Windows, Linux, Mac, Android and Web-based apps. The best Celestia alternative is Stellarium, which is both free and Open Source. Other great apps like Celestia are Space Engine, Universe Sandbox, Solar System Scope and Noctua Stellarium.
Aciqra (uh-SEE-kruh) is a free and open source virtual sky map and planetarium which tracks and displays astronomical bodies including planets, nebulae and stars to an accuracy of a fraction of a degree for thousands of years into both the future and the past.
StarCalc is the fastest professional astronomy planetarium & star mapping program for Windows 9x/ME/NT/2000/XP (StarCalc version for PocketPC is available). It illustrates star positions of any instance of the day observed from any geographic locations on the Earth.
Visit distant exoplanets on a thrilling journey through our galaxy! Exoplanet Explorer presents interactive 3D models of real solar systems and visualises planets that have been discovered around distant stars.
SourceForge presents the Solar Model project. Solar Model is an open source application. SourceForge provides the world's largest selection of Open Source Software. The Solar Model is real time modeling of solar system.
The Sun's and Earth's rotation axes are both tilted with respect to the ecliptic, the plane of the Earth's orbit around the Sun.
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