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The elliptical orbits of planets were indicated by calculations of the orbit of which astronomical body?

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The elliptical orbits of planets were indicated by calculations of the orbit of which astronomical body?

(a) Mercury

(b) Earth

(c) Earth’s moon

(d) Mars

I got this question in an interview.

I'm obligated to ask this question of Gravitation in portion Gravitation of Physics – Class 11

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The correct answer is (d) Mars

The best explanation: By observing the motion of Mars in the sky, Kepler inferred that the planets have elliptical orbits around the sun. Kepler discovered that a simple ellipse would clearly define the orbit of Mars and eliminate many complexities. It would also eliminate the need for epicycles.

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