Hamster3null
........nice info on the satellite from MM43 and the others . .........can I just add that the system is not nearly as symmetrical as you might think..the earth is not a sphere and has an equatorial bulge due to spin .....the earth and moon act as a binary system in orbit around each other , so the actual centre of gravity of the "system" is some 4000km away from the centre of the earth in the direction of the moon , it causes a slight bulge on the surface of the earth , and the tides too........so any item in orbit around the earth has a bit of a balancing act to perform.....