Which systematic error arises when a mariner incorrectly shades the sun during sextant observation at sea?

💡 Explanation

When the sun isn't aligned centrally on the sextant mirror due to poor shading, induced off axis reflections cause subtle distortions in the observed angle owing to imperfections of mirrors. Therefore instrumental error arises, instead of parallax, deviation, or refraction errors which depend on lunar position, magnetic fields or air density and not the instrument misalignment.

• Which limitation constrained the early practical adoption of John Harrison's marine chronometer design during mid-18th century navigation?
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• Which risk increases when prolonged operation of a 18th-century wooden sailing ship occurs in tropical waters?
• Which structural problem plagued ironclad warships attempting ramming maneuvers circa 1870?
• Which error amplified during multi-sight celestial navigation using an 18th-century sextant affects calculated longitude most significantly?
• Which primary outcome resulted from the Three Sisters farming technique in pre-Columbian North America?