Which navigational error arises using a sextant with index error during twilight observations?

💡 Explanation

When a sextant possesses index error, angular measurements are offset because the mirrors are misaligned, causing inaccurate altitude readings of celestial bodies during twilight observations because light availability is suboptimal. Therefore, incorrect altitude is the result, rather than errors in speed, bearing, or tides which rely on separate observation methods.

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