Stellarium is an open source desktop planetarium. It renders the skies in realtime using OpenGL, which means the skies will look exactly like what you see with your eyes, binoculars, or a small telescope.
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I think that the best effect from the application can be got in combination with a projector and 3D technology. Just imagine how beautiful it can be.
It gave me a magnificent feeling of floating in space. It is incredibly easy to lose the track of time when you deal with this application, so be careful. As I can't afford a telescope, nor a flight into space to enjoy the stars, this is the most acceptable way for me to enjoy the magic of space flights.
I totally love this software, because it gives me an opportunity to make a journey I have always dreamed about and will never make in the real world: I mean an interstellar journey, though not aboard a spacecraft. What's even better, I am an early bird and, therefore, have a chance to observe the star sky only seldom (mostly at parties with a bottle of beer in my hands), and this program allows me to watch the night sky even at noon.