Which inaccuracy increased in celestial navigation when using a sextant after prolonged voyages?

💡 Explanation

When sextants were used for extended periods at sea, mechanical wear of the index arm occurred because the arms and gears would slowly degrade, leading to cumulative angular errors. Therefore systematic error increases, rather than random variations from spray, or predictable parallax and refraction errors, needing recalibration onboard ships.

• Which structural failure was a primary risk in Roman castra fortifications during prolonged siege?
• Which mechanism allows for precise timekeeping in the Antikythera Mechanism despite its age?
• Which effect limited long section road construction in pre-Roman Europe before 300 BC?
• Which mechanism enabled Roman aqueducts to maintain a consistent water flow across valleys despite elevation changes?
• Which mapping transformation causes distortions when projecting the celestial sphere using an astrolabe's stereographic projection?
• Which structural instability primarily affected Roman fortifications incorporating stacked earthen ramparts?