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Which accuracy constraint limited astronomical observations made using quadrant instruments in medieval Islamic observatories?

A)Atmospheric refraction at zenith
B)Telescopic lens chromatic aberration
C)Mount flexibility under scale weight
D)Parallax error from Earth's orbit

💡 Explanation

When a quadrant instrument is subjected to gravitational forces due to scale markings, mount flexibility introduce angular errors, compromising accurate altitude measurements. Therefore mount flexibility limited observations, rather than refraction/aberration or parallax which require atmosphere or heliocentric considerations absent from naked-eye quadrants.

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