Stellarium, a stellar software.

They say,

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.

I tried it and I found it as a nice addition to my PC. It is available for Mac., Win. as well as for Linux. As a user we have to just set the coordinates, and it show the sky view, showing in 3D. Its 3D is what we can call 'A' class. Since its a part of open source community we can certainly look forward to continous development. It certainly boasts of few rich features, which previous 2D similar softwares didnt provided.
Best thing which I can suggest you after downloading this software is opening a local planetarium sort of thing. Which you can certainly do woth the help of a projector and a computer.

My suggestion >>> Go get it.