History of the metreThe history of the metre starts with the Scientific Revolution that is considered to have begun with Nicolaus Copernicus's publication of De revolutionibus orbium coelestium in 1543. Increasingly accurate measurements were required, and scientists looked for measures that were universal and could be based on natural phenomena rather than royal decree or physical prototypes. Rather than the various complex systems of subdivision then in use, they also preferred a decimal system to ease their calculations.
MetreThe metre (or meter in American spelling; symbol: m) is the base unit of length in the International System of Units (SI). The metre was originally defined in 1791 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km. In 1799, the metre was redefined in terms of a prototype metre bar. The actual bar used was changed in 1889. In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86.
Emmanuel MacronEmmanuel Jean-Michel Frédéric Macron (emanɥɛl makʁɔ̃; born 21 December 1977) is a French politician serving as President of France since 2017. Ex officio, he is also one of the two Co-Princes of Andorra. Earlier, he served as the Minister of Economics, Industry and Digital Affairs under President François Hollande from 2014 to 2016 and Deputy Secretary-General to the President from 2012 to 2014. Born in Amiens, Macron studied philosophy at Paris Nanterre University, later completing a master's degree in public affairs at Sciences Po and graduating from the École nationale d'administration in 2004.
AmiensAmiens (English: æˈmjæ̃ or ˈæmiənz ; amjɛ̃; Anmien, Anmiens or Anmyin) is a city and commune in northern France, located north of Paris and south-west of Lille. It is the capital of the Somme department in the region of Hauts-de-France and had a population of 135,429, as of 2021. A central landmark of the city is Amiens Cathedral, the largest Gothic cathedral in France. Amiens also has one of the largest university hospitals in France, with a capacity of 1,200 beds.
