Which risk increases when an astrolabe's alidade angle calculation employs inaccurate trigonometric identities, common before rigorous algebraic proofs?

💡 Explanation

Unreliable visibility calculations occur because imprecise identities impact the astrolabe's alidade's trigonometric calculations, an error induced by using empirically derived identities without algebraic proof. Therefore, star positions become inaccurate, rather than merely affecting shadow orientation or alignment.

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