# Remote sensing satellites are placed in which of the following orbits. A.Geo-synchronous.B.Semi-synchronous.C.Sun-synchronous.D.Sub-synchronous

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Hint: In most recent communication systems the satellites are used geosynchronous orbits. The synchronous orbit appears to oscillate north and south. An elliptical orbit appears to oscillate eastward and westward. The weather satellites are mostly circular and placed in the low earth orbit.

Generally, the sun-synchronous orbits are around the oblate planets like mars. around the earth, the sun-synchronous orbit altitude is $600 - 800$ km.
When an orbit or period is greater than the synchronous orbit then it’s said to be a super synchronous orbit. The communication satellites are usually placed in the geostationary or near the geostationary orbits. Hence the satellite antenna communicates with them without moving and it pointed fixe at the particular locations. Most satellites are orbiting the earth at altitudes between $160{\text{ }}and{\text{ }}2000km$.