Which systematic error increases when using a sextant with a loose index mirror on a sailing ship?

💡 Explanation

When the index mirror is loose, small movements drastically change the angle of reflected light because it introduces a geometric misrepresentation of the observed bodies during angle measurement. Therefore instrumental error results, rather than horizon distortion, parallax, or timing, which depend on environmental conditions or other instruments.

• Which outcome critically depended on controlled tin-copper ratios during Bronze Age metallurgy?
• Which mechanism allowed pre-industrial water wheels to efficiently grind grain using a limited water supply?
• Which error increases when astrolabe alidade misaligned beyond manufacturer tolerance?
• Which structural failure mode commonly affected timber sailing ships as they aged, especially in tropical waters?
• Which geometrical consequence results when ancient Babylonian mathematicians incorrectly assumed linearity in approximating square roots using algebraic techniques?
• Which benefit directly arose from pre-Columbian chinampa agriculture in the valley of Mexico?