WinStars is an interactive astronomy program for exploring the night sky and visualizing the solar system in 3D. Set an Earth location and date to view the observable sky, navigate with the mouse, and inspect stars, nebulae, galaxies and clusters. It also calculates astronomical events and positions of planets, moons, comets and asteroids, and can drive a wide range of telescopes.

WinStars is an interactive astronomy program for exploring the night sky and visualizing objects across the solar system. It is useful to amateur astronomers, telescope users and anyone curious about the positions, distances and appearance of celestial objects. A 3D view lets users change the observation point, look around the sky and move between planets, making it possible to examine scenes that cannot be viewed from Earth, such as the sky from the surface of Europa.

The sky view can be set for a location on Earth and a chosen date, giving a representation of what is observable from that viewpoint. Mouse controls adjust the direction of observation in real time. The catalogue includes 2.5 million stars and 10,000 nebulae, galaxies and star clusters; selecting an object provides detailed information about it. Coordinate grids, the celestial equator and the ecliptic can be displayed to help orient observations and relate objects to familiar astronomical reference lines.

WinStars calculates notable astronomical phenomena for an Earth-based observation point and positions for comets, asteroids and the principal satellites of Mars, Jupiter, Saturn, Uranus and Neptune. Its solar-system tools show planetary orbits in three dimensions and can follow space probes on their journeys. Planetary calculations use JPL DE 404 theories, supporting precise representations of the events shown. These features let users explore orbital relationships, follow changing positions or view an event from a different world.

For practical observing, the program can drive a wide range of telescopes. Optional Internet resources provide updated comet and asteroid elements, satellite visibility information and access to Digitized Sky Survey servers, which can return an image of the displayed region of sky. Automatic updates help keep program resources current. WinStars is also compatible with the BOINC version of SETI@home, extending its usefulness for people interested in astronomy and related projects.

WinStars is freeware for Windows, including Windows 7, and is developed in C++. It combines a large object catalogue, real-time sky navigation, solar-system visualization and observing tools in one application. Users can begin with a familiar view of the sky above a chosen location, then move into three-dimensional planetary scenes or investigate the positions and details of less visible objects.

New Release
New languages: Arabic, Persian, Chinese, Japanese
Various optimizations.
[ WinStars release history ]

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