Imagine an 18th-century ship whose sextant mirror coating degrades; which outcome results at twilight during celestial navigation?

💡 Explanation

Twilight observations rely on a semi-visible horizon line; degraded coating impairs light transmission impacting reflection, triggering increased optical distortion because of degraded *specular reflection*. Therefore, altitude reading errors increase, rather than affecting timekeeping from the chronometer, ship strength or compass reliability.

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