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Why does the orbit take the shape of an ellipse or circle?

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Why does the orbit take the shape of an ellipse or circle?

(a) Position can be easily determined

(b) Consume less fuel

(c) Most efficient geometry

(d) Better coverage on earth

I have been asked this question during an online interview.

This interesting question is from Satellite Orbits in division Satellite Communication of Avionics

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Correct option is (a) Position can be easily determined

Easiest explanation: A satellite rotates about the earth in either a circular or an elliptical path. Circles and ellipses are geometric figures that can be accurately described mathematically. Because the orbit is either circular or elliptical, it is possible to calculate the position of a satellite at any given time.

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