**Distance To The Horizon**

Ignoring the effect of atmospheric refraction, distance to the horizon from an observer close to the Earth's surface is about

where *d* is in kilometres and *h* is height above ground level in metres.

Examples:

- For an observer standing on the ground with
*h*= 1.70 metres (5 ft 7 in) (average eye-level height), the horizon is at a distance of 4.7 kilometres (2.9 mi). - For an observer standing on the ground with
*h*= 2 metres (6 ft 7 in), the horizon is at a distance of 5 kilometres (3.1 mi). - For an observer standing on a hill or tower of 100 metres (330 ft) in height, the horizon is at a distance of 39 kilometres (24 mi).
- For an observer standing at the top of the Burj Khalifa (828 metres (2,717 ft) in height), the horizon is at a distance of 111 kilometres (69 mi).

With *d* in miles and *h* in feet,

Examples, assuming no refraction:

- For an observer on the ground with eye level at
*h*= 5 ft 7 in (5.583 ft), the horizon is at a distance of 2.9 miles (4.7 km). - For an observer standing on a hill or tower 100 feet (30 m) in height, the horizon is at a distance of 12.2 miles (19.6 km).
- For an observer on the summit of Aconcagua (22,841 feet (6,962 m) in height), the sea-level horizon to the west is at a distance of 184 miles (296 km).

Read more about this topic: Horizon

### Famous quotes containing the words distance and/or horizon:

“From a *distance* the rushing of the torrent delights and uplifts us, but it rocks us in a flimsy boat, we are overwhelmed by despair. The same applies to danger.”

—Franz Grillparzer (1791–1872)

“Four spectres haunt the Poor—Old Age, Accident, Sickness and Unemployment. We are going to exorcise them. We are going to drive hunger from the hearth. We mean to banish the workhouse from the *horizon* of every workman in the land.”

—David Lloyd George (1863–1945)