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← HistoryWhich 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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