ANSWERS: 1
  • The dependable Wikipedia comes through again: http://en.wikipedia.org/wiki/Horizon The straight line of sight distance d in kilometers to the true horizon on earth is approximately d = square root (13h) where h is the height above ground or sea level (in meters) of the eye of the observer. Examples: * 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. * For an observer standing on a hill or tower of 100 m in height, the horizon appears at a distance of 36 km. To compute the height of a tower, the mast of a ship or a hilltop visible above the horizon, add the horizon distance for that height. For example, standing on the ground with h = 1.70 m, one can see, weather permitting, the tip of a tower of 100 m height at a distance of 4.7+36 ≈ 41 km.

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