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- Master & Chief Mate (Oceans or Near Coastal (Offshore Supply Vessel)) »
- Q204 - Navigation General: Oceans
80. The error in a sextant altitude caused by refraction is greatest when the celestial body is in which location?
Refraction error is greatest when a celestial body is near the horizon because light travels through the most atmosphere, resulting in the greatest bending. The error decreases as the body's altitude increases, becoming minimal when high in the sky.
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