Moon is an Open Source, portable app that allows you to design space missions for educational or experimental use.

Moon will create a desktop shortcut for you the first time you launch the program. Expect to be overwhelmed; a lot is going on for such a small size. At MajorGeeks we like to say that "Sometimes it is Rocket Science." While this isn't what we meant, Moon certainly applies in its unique way.

Expect to spend some time learning about the app, but it's worth the effort for space enthusiasts. Use the toolbar at the top of the main window to control the simulation, show or hide auxiliary panels, load predefined presets or configure the program.

The main window is an OpenGL 3D viewer that shows the progress of the spacecraft trajectory during the mission simulation. Additional panels are available to define the spacecraft and trajectory parameters. A set of predefined missions is provided including sub-orbital flights, LEO and GEO orbits, the Moon landing and deep space missions.