Which astronomical calculation was fundamentally limited by the planispheric projection inherent to astrolabes?

💡 Explanation

Astrolabes use a stereographic projection, causing angular distortions that become significant far from the projection point, creating progressively inaccurate altitude measurements as the moon shifts furthest from its reference location, known as lunar parallax. Therefore, measuring lunar parallax is inherently limited, rather than planetary motion or sunrise calculations which have less sensitivity to angular distortion.

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