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The direction of orbit in the same direction of earth rotation is called ______

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The direction of orbit in the same direction of earth rotation is called ______

(a) Retrograde

(b) Posigrade

(c) Perigee

(d) Apogee

I had been asked this question by my school principal while I was bunking the class.

The doubt is from Satellite Orbits topic in section Satellite Communication of Avionics

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Correct option is (b) Posigrade

For explanation: The direction of satellite rotation may be either in the same direction as the earth’s rotation or against the direction of earth’s rotation. In the former case, the orbit is said to be posigrade, and in the latter case, retrograde. Most orbits are posigrade.

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