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A nautical mile is a unit of length used in air, marine, and space navigation, and for the definition of territorial waters. [2] [3] [4] Historically, it was defined as the meridian arc length corresponding to one minute ( 1 / 60 of a degree) of latitude at the equator, so that Earth's polar circumference is very near to 21,600 nautical miles (that is 60 minutes × 360 degrees).
A light-year, alternatively spelled light year ( ly or lyr[ 3] ), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km ( Scientific notation: 9.4607304725808 × 10 12 km), which is approximately 5.88 trillion mi.
From 1630 to 1718 a millia was 5,564 feet (1,696 metres), making a geographical league of four millias equal 22,256 feet (6,784 m or 3.663 modern nautical miles). But from 1718 through the 1830s the millia was defined as the equivalent of just over 5,210 feet, giving a shorter geographical league of just over 20,842 feet (6,353 m or 3.430 ...
The data mile is used in radar-related subjects and is equal to 6,000 feet (1.8288 kilometres). [90] The radar mile is a unit of time (in the same way that the light year is a unit of distance), equal to the time required for a radar pulse to travel a distance of two miles (one mile each way). Thus, the radar statute mile is 10.8 μs and the ...
Li. (unit) Map of the eastern South China Sea from 1588; each grid square is 400 li (about 133 km or 80 miles). Li ( Chinese: 里, lǐ, or 市里, shìlǐ ), also known as the Chinese mile, [citation needed] is a traditional Chinese unit of distance. The li has varied considerably over time but was usually about one third of an English mile and ...
3.0976 × 106 sq yd. 640 acres. SI units. 2.59 × 106 m2. 2.59 km2. The square mile (abbreviated as sq mi and sometimes as mi2) [ 1] is an imperial and US unit of measure for area. One square mile is equal to the area of a square with each side measuring a length of one mile. [ 2]
The knot ( / nɒt /) is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h (approximately 1.151 mph or 0.514 m/s ). [ 1][ 2] The ISO standard symbol for the knot is kn. [ 3] The same symbol is preferred by the Institute of Electrical and Electronics Engineers ( IEEE ), while kt is also common, especially in aviation, where ...
Roman milestone in modern Austria (AD 201), indicating a distance of 28 Roman miles (~41 km) to Teurnia. The basic unit of Roman linear measurement was the pes (plural: pedes) or Roman foot. Investigation of its relation to the English foot goes back at least to 1647, when John Greaves published his Discourse on the Romane foot.