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← HistoryWhich condition in early Islamic quadrants led to inaccurate angular measurements?
A)Thermal expansion of brass arms✓
B)Sublimation affecting sighting materials
C)Insufficient magnetic declination correction
D)Hysteresis due to imperfect bearings
💡 Explanation
In early devices, thermal expansion modified inscribed angles, skewing altitude measurements; this is thermal distortion, because brass's coefficient expands significantly on warm summer days, therefore measurements were erroneous, rather than only suffering from sighting imperfections.
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