Broadening your horizons
Stories from Physics for 11-14 14-16
A straightforward geometrical calculation can determine an approximation for the distance to the horizon given an observer’s height above the surface of the Earth: d= √ km, where d is the distance to the horizon in km and H is the vertical height in metres of the observer above the ground. A person with their eyes 2 m above the ground will see the horizon at a distance of approximately 5 km. A further correction can be made to account for the deviation of the path of light due to refraction.