Although the only real spacecraft available in the base install of Orbiter 2006 is the Space Shuttle Atlantis, there is a large add-on community which has produced extra spacecraft, such as the historic Apollo spacecraft. Luckily it comes with a lot of documentation and tutorials.
It involves a lot of scientific calculations, even just to orbit the Earth. Orbiter is a Newtonian physics-based space flight simulator. About The virtual cockpit of the Space Shuttle Atlantis. The most recent release of the game is Orbiter 2010 P1. It is available as a free download from the official Orbiter site.
Orbiter is a spaceflight simulator for the PC.
