Nice Free and multi-language software for seizing the constellations in sky

source :

螢幕快照 2015-03-13 下午8.44.12

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.