Which systematic error increases when an 18th-century navigator uses a sextant at very high latitudes?

💡 Explanation

When sextants are used at high latitudes pointing near zenith, parallax error increases because small angular errors in measurement translate into larger positional errors. Therefore unresolved parallax increases error, rather than horizon blurring, timekeeping errors, or star visibility reduction, all of which stem from distinct environmental factors.

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