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  1. ________ is the time taken by the Earth to return to a given point in its orbit with reference to a fixed star.

  2. A.

     Lunar year

    B.

     Sidereal year

    C.

     Solar year

    D.

     Tropical year

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    Answer : Option B

    Explanation :

    Because, for all intents and purposes, the sky is “fixed”, a sidereal day is when the earth rotates 360°. A sidereal day is 23 hours 56 minutes and 4.09 seconds long. A sidereal year is the time it takes for the sun to return to the same position with respect to the stars.


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