Because that's all you can see of the horizon. Tall people see a further horizon, shorter people see a closer one.
Horizon B
O horizon A horizon E horizon B horizon and c horizon
A horizon B horizon C horizon O horizon
the horizon that contains topsoil is the A HORIZON
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A very rough or "ball park" figure is about 20 miles. Comment: It depends on your height above the water. You could only see 20 miles if you were well above sea level. If you are standing more or less at sea level, with your eyes just a few feet above the water level, you could see only about 3 or 4 miles. For example: Eye level at 6 feet: horizon at about 3 miles. Eye level at 24 feet: horizon at about 6 miles. Eye level at 96 feet: horizon at about 12 miles. Eye level at 270 feet : horizon at about 20 miles.
Because that's all you can see of the horizon. Tall people see a further horizon, shorter people see a closer one.
I'm not certain that it matters just how tall you are, but at sea level I think the horizon is about 7 miles away.....
Horizon
Altitude is the angle measured above the horizon.
Daytime starts at sunrise and ends at sunset. Sunrise and sunset occur when the top limb of the Sun is level with the horizon at sea level.
If you had an unobstructed view, the horizon at sea level would be approximately 24 miles away.
multi-level bulleted list slide
a horizon
Horizon B
original answer of 45 mi was way off. Wikipedia's horizon article gives the equationdistance = square root of (height * 13). From the article:For an observer standing on the ground with h = 1.70 m (average eye-level height), the horizon appears at a distance of 4.7 km. 4.7 km = ~ 3 miles or ~2.5 nautical mile.