Sea horizon
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1-2-110
The small circle on the earth's surface at which the sea and sky appear to meet, forming the field of view. As a result of the curvature of the earth and of atmospheric refraction of light, the observer can see more than half the celestial sphere. The visible horizon therefore lies below the celestial horizon.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
