Stellarium is a software project that allows people to use their home computer as a virtual planetarium. It will calculate the positions of the Sun and Moon, planets and stars, and draw how the sky would look to an observer depending on their location and the time. It can also draw the constellations and simulate astronomical phenomena such as meteor showers, and solar or lunar eclipses.
Stellarium may be used as an educational tool for teaching about the night sky, as an observational aid for amateur astronomers wishing to plan a night’s observing or even drive their telescopes to observing targets, or simply as a curiosity (it’s fun!). (Credit : Stellarium User Guide)