The Universe in your computer

WinStars is a planetarium running on computers, tablets and mobiles. It is a 3D simulator that accurately represents celestial objects at a given time. It also allows you to travel in our galaxy and its close neighbourhood. A thread dedicated to scientific news allows you to follow and display in the software the results of research currently conducted in astrophysics. WinStars is a software in constant evolution. New functions are regularly added to make it an educational tool dedicated to the discovery of our Universe.


Jupiter and Saturn: Great conjunction 2020

A Great conjunction is a conjunction of the planets Jupiter and Saturn. Great conjunctions occur regularly (every 19.6 years, on average) due to the combined effect of Jupiter’s approximately 11.86-year orbital period and Saturn’s 29.5-year orbital period and due to the proximity of the orbits of the planets. The upcoming Great conjunction will occur on …



Release 3.0.196 (2021/04/06):

version x64 (Windows 10 only)

version x86 (compatible with Windows 7, 8.1 & 10)

(Warning: using WinStars 3 on an obsolete machine running Windows 7 may cause serious compatibility problems).

If you want to update an existing installation of WinStars3, please use the Maintenance Tool located in the main WinStars3 folder (typically c:\program files\winstars3).


You can now download the release version on the Google Play store :

macOS X

on App Store :


Want to try the test version for iOS? Write me at

Ubuntu 20.04 x64

Release 3.0.199 (2021/04/06):

Follow this procedure