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← HistoryWhich outcome occurs when the alidade on a medieval astrolabe becomes bent?
A)Parallax measurement becomes inherently unstable
B)Hour angles become intrinsically misaligned
C)Celestial altitude estimation becomes inaccurate✓
D)Horizon projection inherently becomes warped
💡 Explanation
Inaccurate altitude estimation occurs because deformation of the alidade impairs angular measurement, altering the apparent zenith distance observed by the user via direct sighting. Therefore the observed altitude deviates, rather than creating effects on parallax or timekeeping.
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