Geographical Mile
The geographical mile is a unit of length determined by 1 minute of arc along the Earth's equator. For the 1924 International Spheroid this equalled 1855.4 metres. Any greater precision depends more on choice of standard than on more careful measurement: the length of the equator in the World Geodetic System WGS-84 is 40,075,016.6856 m which makes the geographical mile 1855.3248 m, while the International Astronomical Union standard IAU-2000 takes the equator to be 40,075,035.5351 m making the geographical mile 1855.3257 m, almost a millimetre longer.
Read more about Geographical Mile.
Famous quotes containing the words geographical and/or mile:
“Men’s private self-worlds are rather like our geographical world’s seasons, storm, and sun, deserts, oases, mountains and abysses, the endless-seeming plateaus, darkness and light, and always the sowing and the reaping.”
—Faith Baldwin (1893–1978)
“It was a tangled and perplexing thicket, through which we stumbled and threaded our way, and when we had finished a mile of it, our starting-point seemed far away. We were glad that we had not got to walk to Bangor along the banks of this river, which would be a journey of more than a hundred miles. Think of the denseness of the forest, the fallen trees and rocks, the windings of the river, the streams emptying in, and the frequent swamps to be crossed. It made you shudder.”
—Henry David Thoreau (1817–1862)