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Which risk increases when a 1760s sextant's index mirror is slightly misaligned about its vertical axis?

A)Systematic error in all altitude measurements
B)Random errors dependent on sea conditions
C)Reduced clarity of the horizon line
D)Difficulty in aligning the instrument accurately.

💡 Explanation

When the index mirror's axis is misaligned, a systematic error is introduced because the reflected angle is not perfectly bisected which results in all altitude measurements being consistently offset. Therefore bias in EVERY reading results, rather than random errors, horizon clarity issues, or basic alignment difficulties which rely on other mechanisms.

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