Which navigational outcome occurs when temperature gradients cause variations of air density during celestial navigation using a sextant?

💡 Explanation

When temperature gradients cause variations of air density, atmospheric refraction occurs because of the bending of light rays depending on density, leading to inaccurate altitude measurements of celestial bodies. Therefore, a systematic error in altitude readings results, rather than compass shifts, increased clouds, or COG changes which relate to different physical phenomena.

• Which structural problem was frequently encountered when Roman legionary fortresses extended timber ramparts on sloped ground?
• Which mapping transformation causes distortions when projecting the celestial sphere using an astrolabe's stereographic projection?
• Which mechanism limited the Roman castra's defensive capacity against prolonged sieges during expansion?
• Which long-term consequence resulted from the selective use of tin-bronze alloys for Sumerian cuneiform styluses over copper?
• Which limitation occurred with early brass astrolabes used in arid desert climates due to high diurnal temperature?
• Which outcome resulted when Islamic scholars used algebra to solve geometric construction problems?