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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).
Units in everyday use by country as of 2019 The history of the metric system began during the Age of Enlightenment with measures of length and weight derived from nature, along with their decimal multiples and fractions. The system became the standard of France and Europe within half a century. Other measures with unity ratios [Note 1] were added, and the system went on to be adopted across ...
New World Heritage Sites. Opening of the 1118 km Golmud to Lhasa railway in China, the highest railway in the world. Opening of the 32.5 km cross sea Donghai bridge, in China, linking Shanghai to the deepwater port on Xiaoyang Shan island." [3] A Luxury Edition was also offered from 2008, bound by Book Works Studio in London.
Dymaxion map of the world with the 30 largest countries and territories by area. This is a list of the world's countries and their dependencies, ranked by total area, including land and water. This list includes entries that are not limited to those in the ISO 3166-1 standard, which covers sovereign states and dependent territories.
All over the world, countries have transitioned from local and traditional units of measurement to the metric system. This process began in France during the 1790s , and has persistently advanced over two centuries, accumulating into 95% of the world officially only using the modern metric system . [ 2 ]
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Posidonius calculated the Earth's circumference by reference to the position of the star Canopus.As explained by Cleomedes, Posidonius observed Canopus on but never above the horizon at Rhodes, while at Alexandria he saw it ascend as far as 7 + 1 ⁄ 2 degrees above the horizon (the meridian arc between the latitude of the two locales is actually 5 degrees 14 minutes).