Which optical consequence occurs when an astrolabe 's alidade arm degrades during prolonged exposure to high intensity insolation?

💡 Explanation

Prolonged heat causes material (possibly glued) creep within the alidade arm; this mis-alignment creates systematic parallax because it alters the measured altitudes. Therefore, a gradual error emerges, rather than effects like spherical/chromatic aberration arising primarily from lens imperfections.

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