Hoe bereken je de afstand tot de horizon?

[zebeke]

Zie

http://www.wikihow.com/Calculate-the-Di ... he-Horizon

Volgens mij is die berekening niet correct.
Wat is verkeerd aan deze berekening?



ubi dubium, ibi libertas
zebeke

[Thomas]

5.
Understand how this calculation works. It's based on a triangle formed by your observation point (your eyes), the true horizon point (what you're looking at) and the center of the Earth. By knowing the radius of the Earth and measuring your height of eye and local elevation, that leaves only the distance between your eyes and the horizon as unknown. Since the sides of the triangle that meet at the horizon actually form a right angle, we can use the Pythagorean theorem (good old a^2 + b^2 = c^2) as the basis for this calculation, where:

• a = R (the radius of the Earth)

• b = the distance to the horizon, unknown

• c = h (your height of eye) + R

Lees dat stukje op die site en kijk goed naar het plaatje er naast. Het is gewoon de stelling van Pythagoras gebruiken.