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The largest unit for expressing distances across space at that time was the astronomical unit, equal to the radius of the Earth's orbit at 150 million kilometres (93 million miles). In those terms, trigonometric calculations based on 61 Cygni's parallax of 0.314 arcseconds, showed the distance to the star to be 660,000 astronomical units (9.9 ...
Using the Greek stadium of 185 to 190 metres, [30] [31] the former translation comes to 754,800 km to 775,200 km, which is far too low, whereas the second translation comes to 148.7 to 152.8 billion metres (accurate within 2%). [32] Hipparchus also gave an estimate of the distance of Earth from the Sun, quoted by Pappus as equal to 490 Earth radii.
League (unit) A league is a unit of length. It was common in Europe and Latin America, but is no longer an official unit in any nation. Derived from an ancient Celtic unit and adopted by the Romans as the leuga, the league became a common unit of measurement throughout western Europe. Since the Middle Ages, many values have been specified in ...
The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour). [Note 3] According to the special theory of relativity, c is the upper limit for the speed at which ...
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 ...
Islands of unconfirmed area. Antarctic territorial claims by Chile and United Kingdom. It is 61 km (38 mi) long and between 13 and 34 km (8.1 and 21.1 mi) wide. [ 45] Antarctic territorial claims by Australia. Island has a diameter of 0.40 km (0.25 mi). [ 46] Antarctic territorial claims by Chile and United Kingdom.
The Kármán line (or von Kármán line / vɒn ˈkɑːrmɑːn /) [ 2] is a conventional definition of the edge of space. It is not universally accepted. The international record-keeping body FAI (Fédération aéronautique internationale) defines the Kármán line at an altitude of 100 kilometres (54 nautical miles; 62 miles; 330,000 feet ...
The square kilometre ( square kilometer in American spelling; symbol: km2) is a multiple of the square metre, the SI unit of area or surface area . 1 km 2 is equal to: 1,000,000 square metres (m 2) 100 hectares (ha) It is also approximately equal to: 0.3861 square miles [2] 247.1 acres [3] Conversely: