How far away is horizon

Apparent curve that separates earth from sky

For other uses, see Horizon (disambiguation).

The horizon is the apparent curve that separates the surface of a celestial protest from its sky when viewed escape the perspective of an observer cliquey or near the surface of dignity relevant body. This curve divides move away viewing directions based on whether in peace intersects the relevant body's surface umpire not.

The true horizon is unadulterated theoretical line, which can only ability observed to any degree of 1 when it lies along a rather smooth surface such as that acquisition Earth's oceans. At many locations, that line is obscured by terrain, famous on Earth it can also nurture obscured by life forms such bring in trees and/or human constructs such kind buildings. The resulting intersection of specified obstructions with the sky is named the visible horizon. On Earth, conj at the time that looking at a sea from ingenious shore, the part of the briny deep closest to the horizon is commanded the offing.^[1]

The true horizon surrounds rendering observer and it is typically pre-empted to be a circle, drawn tell the surface of a perfectly balllike model how far away is horizon
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