Which limitation impacted early astrolabe accuracy due to material imperfections?

💡 Explanation

Spherical aberration impacted lenses because variations in medieval glass density distorted refraction. Thus, point sources appeared blurred, degrading angle measurements necessary for celestial navigation, rather than expansion or backlash, which are mechanical errors less relevant for refracted beam shaping.

• Which visual consequence arose in pre-telescopic astronomy because of spherical aberration when refining observational instruments?
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