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The Welsh mile (milltir or milldir) was 3 statute miles and 1,470 yards long (6.17 km). It comprised 9,000 paces ( cam ), each of 3 Welsh feet ( troedfedd ) of 9 inches ( modfeddi ). [ 32 ] ( The Welsh inch is usually reckoned as equivalent to the English inch.)
= 6,371.009 kilometers = 3,958.761 statute miles = 3,440.069 nautical miles. = Distance between the two points, as measured along the surface of the Earth and in the same units as the value used for radius unless specified otherwise.
kilometre (km) or kilometer is a metric unit used, outside the US, to measure the length of a journey; the international statute mile (mi) is used in the US; 1 mi = 1.609344 km; nautical mile is rarely used to derive units of transportation quantity.
The kilometre (SI symbol: km; / ˈ k ɪ l ə m iː t ər / or / k ɪ ˈ l ɒ m ə t ər /), spelt kilometer in American and Philippine English, is a unit of length in the International System of Units (SI), equal to one thousand metres (kilo-being the SI prefix for 1000).
Astronomical measure uses: Earth radius R 🜨 ≈ 6,371 km [9] Lunar distance LD ≈ 384 402 km. [10] Average distance between the center of Earth and the center of the Moon. astronomical unit au. Defined as 149 597 870 700 m. [11] Approximately the distance between the Earth and Sun. light-year ly ≈ 9 460 730 472 580.8 km.
On land, the league is most commonly defined as three miles (4.83 km), although the length of a mile could vary from place to place as well as depending on the era. At sea, a league is three nmi (3.452 mi; 5.556 km).
In radar-related subjects and in JTIDS, a data mile is a unit of distance equal to 6,000 feet (1,829 metres; 0.9875 nautical miles; 1.136 miles). An international mile is 0.88 data mile. The speed of light is 299,792,458 metres per second (983,571,056 ft/s), or about one foot per nanosecond .
Beyond the normal mile, there was also a "forest mile" (skogsmil) that was half as long as the normal mil, i.e. a bit over 5 km (3.1 mi), and equal to an even older unit of measurement, the rast ('rest', 'pause'), so named since it was seen as the distance a man would normally be able to walk between rests, [7] [1] corresponding to the league ...