Orbiting+Bodies+Period+4_

http://science.howstuffworks.com/satellite3.htm
 * A rocket must accelerate to at least 25,039 mph (40,320 kph) to completely escape Earth's gravity and fly off into space
 * **Orbital velocity** is the velocity needed to achieve balance between gravity's pull on the satellite and the inertia of the satellite's motion.
 * **Geostationary**- When the satellite stays over the same spot all the time.
 * Satellites usually start out in an orbit that is elliptical

http://faculty.ifmo.ru/butikov/Relative.pdf
 * Let two satellites orbit the earth. We know that their passive orbital motion obeysKepler’s laws. But how does one of them move relative to the other? This relativemotion is important, say, for the spacecraft docking in orbit. If two satellites arebrought together but have a (small) nonzero relative velocity, they will drift apartnonrectilinearly. In unusual conditions of the orbital flight, navigation is quite differentfrom what we are used to here on the earth, and our intuition fails us. The studyof the relative motion of the spacecraft reveals many extraordinary features that arehard to reconcile with common sense and our everyday experience.