Orbits is an accurate digital orrery with a wealth of functionality.
Orbits uses time-dependent orbital elements for the calculation of planetary positions.
You can participate by running a program that downloads and analyzes radio telescope data. There's a small but captivating possibility that your computer will detect the faint murmur of a civilization beyond Earth. There are 18 properties divided into four categories - orbital, physical, axial, and atmospheric. The Apprentice shows all 18 properties for your selected planet in one scrollable window. Spinning planets bounce around your screen.