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Q: .........is the time taken by the earth to return to a given point in its orbit with reference to a fixed star.
  • A. Lunar year
  • B. Sidereal year
  • C. Solar year
  • D. Tropical year
Correct Answer: Option B - A "Sidereal Year" is the exact amount of time taken by the Earth to orbit the sun. This orbital period is measured with respect to the position of the "fixed" stars. A sidereal year is, then, the time taken by the earth to travel in its orbit around the sun and return to this exact position.
B. A "Sidereal Year" is the exact amount of time taken by the Earth to orbit the sun. This orbital period is measured with respect to the position of the "fixed" stars. A sidereal year is, then, the time taken by the earth to travel in its orbit around the sun and return to this exact position.

Explanations:

A "Sidereal Year" is the exact amount of time taken by the Earth to orbit the sun. This orbital period is measured with respect to the position of the "fixed" stars. A sidereal year is, then, the time taken by the earth to travel in its orbit around the sun and return to this exact position.