Which limitation affected the accuracy historical altitude measurements using astrolabes at sea?

💡 Explanation

When observing celestial bodies near the horizon, atmospheric refraction bends the light, causing objects to appear higher than they are because the index of refraction changes with air density creating substantial errors in angular altitude. Therefore accurate altitude measurements are affected, rather than parallax, magnetic declination, or mechanical inaccuracy which require different failure mechanisms.

• Which mechanical outcome limited the height of stacked stone curtain walls in medieval fortifications lacking mortar?
• Which purpose was primarily fulfilled by raised chinampas, used in pre-Columbian Mesoamerican agriculture?
• Which risk increases when an inadequately designed Pre-Columbian terrace wall experiences prolonged saturation during heavy rainfall?
• Which distortion arises when projecting Earth's spherical surface onto the flat plane of an astrolabe?
• Which outcome resulted when chinampa farming methods experienced prolonged drought conditions in Mesoamerica?
• Which geometrical projection facilitated the construction of flat astrolabes during the Islamic Golden Age?