![]() At many locations, this line is obscured by terrain, and on Earth it can also be obscured by life forms such as trees and/or human constructs such as buildings. The true horizon is a theoretical line, which can only be observed to any degree of accuracy when it lies along a relatively smooth surface such as that of Earth's oceans. This curve divides all viewing directions based on whether it intersects the relevant body's surface or not. The horizon is the apparent curve that separates the surface of a celestial body from its sky when viewed from the perspective of an observer on or near the surface of the relevant body. This places the Sun ( 24 - 21:49 ) 2:11 hours or (2 hr* 15deg/hr + 11 min/(4min/deg) ) 32.A horizon at sunset in High Desert, California, USA
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