Which challenge faced 18th-century lunar distance navigation increased positional uncertainty when using a sextant at sea?

💡 Explanation

Atmospheric refraction most influenced lunar distance accuracy because variations in air density altered the apparent angle between the moon and a star, resulting in measurement errors. Therefore, refraction, rather than instrument errors, posed a greater challenge under varying weather conditions.

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• Which circumstance dramatically increased labor demands for ancient bronze production?
• Which optical consequence resulted from medieval Islamic scholars grinding spherical lens surfaces for astronomical instruments?
• Which outcome occurred when builders used unseasoned timber during the construction of Tudor warships like the Mary Rose?
• Which outcome commonly occurred when early Chinese ironworkers attempted to over-quench a newly cast high-carbon iron components?
• Which agricultural consequence faced pre-Columbian chinampa farmers relying on nitrogen fixation in shallow lake environments given seasonal flooding?