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Which 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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