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Which mechanism reduces apparent angular error when using a sextant under moderately unstable 18th-century conditions?

A)Averaging multiple index-arm position readings
B)Employing a wider objective lens diameter
C)Using longer index-arm and limb lengths
D)Calibrating horizon mirror parallelism beforehand

💡 Explanation

Averaging readings minimizes random angular errors due to transient movements; this is error averaging because it spreads deviations. Therefore option A and not B/C which improve clarity rather than counter transient uncertainty, and not choice D that addresses systematic initial bias instead.

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