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Which inaccuracy most limits celestial navigation accuracy during long 18th-century sea voyages?

A)Sextant calibration drift with temperature cycles
B)Chronometer error accumulation over weeks
C)Incomplete star charts of the southern hemisphere
D)Magnetic compass deviation due to iron cargo

💡 Explanation

When chronometer error accumulates, the deduced longitude becomes increasingly inaccurate because the time difference directly translates to longitudinal error. Therefore, chronometer drift limits long-range accuracy rather than sextant drift, star charts, or magnetic deviation if well-managed throughout the navigation process.

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