Which mechanism limited astrolabe precision during celestial altitude measurement?

💡 Explanation

During altitude measurement of celestial bodies, parallax error occurs because an astrolabe projects the 3D celestial sphere onto a 2D plane, causing distortion at the user eye location that increases with object angular distance. This limits accuracy; therefore parallax error predominates, rather than material expansion failures, backlash caused by manufacturing faults without gears, atmospheric refraction variations which causes distortion.

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