What is a geo-stationary orbit? Are there any other orbits?
Asked by: Manish Mulchandani
A geo-stationary orbit is an orbit of an Earth's satellite whose period of rotation is exactly equal to the period of rotation of Earth about it's polar axis (which is 23 hours, 56 minutes and 4.1 seconds) and whose trajectory is aligned with the Earth's equator.
Any satellite in this orbit will appear as if it is always in the same place in the sky when observed from the same point on the Earth. This orbit is at a distance of approximately 35,900 km from the surface of the Earth. Communication satellites are usually placed into this orbit, with several satellites in the same orbit, distributed around to provide world wide coverage for relaying the telecommunication signals.
A geo-stationary orbit is also sometimes called: stationary, or synchronous orbit.
One can also, launch a satellite into a synchronous orbit that is inclined to the Earth's equator. Once in this orbit, the satellite will trace a figure 8 once every 24 hours. The size and the shape of this figure will depend on the inclination angle.
Other more complicated orbits are also possible - especially if one is considering a space vehicle that has it's own propulsion.
Answered by: Anton Skorucak, M.S. Physics, PhysLink.com Creator
'In a way science is a key to the gates of heaven, and the same key opens the gates of hell, and we do not have any instructions as to which is which gate.
Shall we throw away the key and never have a way to enter the gates of heaven? Or shall we struggle with the problem of which is the best way to use the key?'