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For 18th-century ships using celestial navigation, which risk increases if a quadrant's horizon mirror suffers from thermal expansion?

A)Inaccurate angle measurement offshore
B)Mechanical seizing during gimbals stabilization
C)Excessive hull stress near deck
D)Corrosion of brass fixture anchors

💡 Explanation

Thermal expansion distorts the horizon mirror’s reflective angle, triggering parallax error; because angle mismeasurement arises from misaligned reflection rather than bearing friction, therefore increased instrument pointing errors result rather than material failures at hull stress.

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