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Which consequence arises from index error in sextants?

A)Inaccurate celestial angle measurements
B)Overestimated vessel speed calculation
C)Unreliable magnetic compass readings
D)Premature chronometer spring failure

💡 Explanation

Inaccurate celestial angle measurements transpire through index error, because misaligned mirrors influence the angle calculation along sight paths which involves optical refraction. Therefore, angle readings become flawed, rather than directly affecting speed, compass, or chronometer, which involve separate mechanisms, like Doppler effect or mechanical springs.

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