Which limitation complicated longitude determination despite Harrison's chronometer during 18th-century voyages?

💡 Explanation

When celestial observations calculated local time, atmospheric refraction bending starlight introduced errors because refraction varies with temperature and air pressure causing imprecision in determining the angle to the celestial object at the horizon. Therefore atmospheric refraction variability limited accuracy, rather than deviation, instability, or imperfections, which present different navigational challenges.

• Which agricultural benefit arose in ancient Andean terraced farming due to altered soil drainage patterns?
• Which limiting outcome did annual flooding most directly prevent in pre-Columbian chinampa agriculture of the Valley of Mexico?
• Which mechanism allowed ancient Egyptians to move massive stone blocks for pyramid construction?
• Which mechanism explains why the Romans could build arches from individual voussoirs without mortar?
• Which effect results when ancient Andean terrace retaining walls experience increased hydrostatic pressure from saturated soil?
• Which problem did interlocking timber scantlings address in 18th-century ship construction?