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Which systematic error affected celestial navigation when using a nonius-divided octant aboard ships in the 1700s?

A)Irregular scale gradation errors
B)Mirror silvering delamination effects
C)Atmospheric refraction estimation errors
D)Telescopic lens chromatic aberration

💡 Explanation

Irregular scale gradation created systematic bias because nonius division copied errors rather than smoothing; therefore, readings clustered around certain arc positions, rather than random deviations found in instruments with individually scribed marks.

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