Orbital Velocity of Satellite
 The satellites lowest orbits have the altitude about 185 km, where their speeds are about 7.795 km/s. As a result of the Earth's roundness, the satellite trajectory is circular in shape.
Man-made moons remains on the bottom orbits a few days and at 400 km altitude for a few months. At an 800 km altitude the time is 100 years. Stationary equator telecommunications satelliites have 36 000 km altitude.
G= The Earth gravitation parameter 398 600 km3/s2
r = Earth's radius 6378 km
r = 6378 + 185 km = 6563 km
SQRT = square root
Vcircle orbit = SQRT ( G / r )
Vcircle orbit = SQRT (398 600/6563)
Vcircle orbit = 7,793 km/s
26.12.2015*18:40 (17705 -1210)
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