Which navigational challenge increased when 18th-century ships experienced sustained voyages at high latitudes?

💡 Explanation

When ships sailed at high latitudes, the low sun angle meant incidence angles were shallower during twilight observations, which reduced precision when using a sextant because of atmospheric refraction errors getting magnified. Therefore obtaining precise sextant altitude readings became challenging, rather than chronometer accuracy, lunar distances or compass calibration, related to independent error sources.

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