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← HistoryWhich consequence results when temperature changes affect a sextant?
A)Bearing inaccuracy when sighting landmarks
B)Indexing error altering angular measurements✓
C)Chronometer drift influencing longitude calculation
D)Bubble oscilation affecting vertical sightings
💡 Explanation
Indexing error worsens when thermal expansion occurs within a sextant frame, causing misaligned mirrors; thus, angular measurements become corrupted, because the mechanism of thermal expansion alters the geometry, therefore leading to false readings, rather than simple bearing issues.
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