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  1. While making astronomical observations, the observer is mainly concerned with

    2. A.
    the direction of the vertical, the axis of rotation of the instrument
    B.
    the direction of the poles of the celestial sphere
    C.
    the direction of the star from the instrument
    D.
    all the above.

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    Answer : Option D

    Explanation :

    No answer description available for this question. Let us discuss.

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