Most commonly, the horizon is the border between the surface of a celestial body and its sky when viewed from the perspective of an observer on or above the surface of the celestial body. This concept is further refined as - The true or geometric horizon, which an observer would see if there was no alteration from refraction or from obstruction by intervening objects.
Most commonly, the horizon is the border between the surface of a celestial body and its sky when viewed from the perspective of an observer on or above the surface of the celestial body. This concept is further refined as - The true or geometric horizon, which an observer would see if there was no alteration from refraction or from obstruction by intervening objects.
Source: Wikipedia "Horizon" · CC BY-SA 4.0
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