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Which of the following doesn’t belong to the set of corrections applied in astronomical corrections?

Which of the following doesn’t belong to the set of corrections applied in astronomical corrections? Correct Answer Correction of sag

Astronomical corrections are applied in the case of celestial bodies. They generally include corrections for parallax, for refraction, for semi-diameter, for the dip of horizon. All these are not applied at once but are applied based on the necessity.

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