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← HistoryWhich consequence results when thermal stresses warp a brass sextant's frame during celestial navigation?
A)Parallax error increases significantly
B)Index error will shift unpredictably✓
C)Limb of the sextant cracks
D)Telescope mounting will detach
💡 Explanation
Warping induces unpredictable index error because thermal expansion changes the alignment; therefore, accurate angle readings become impossible rather than increased parallax, cracking, or telescope detachment under slight stress. The key mechanism is thermal distortion.
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