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a b Cajori, Florian (1921). "Swiss Geodesy and the United States Coast Survey". The Scientific Monthly. 13 (2): 117–129. Bibcode: 1921SciMo..13..117C. ISSN 0096-3771. History/origin: Prior to standardization of units of measurement, and the definition of the foot currently in use, the measurement of the foot was used in many different systems including the Greek, Roman, English, Chinese, and French systems, varying in length between each. The various lengths were due to parts of the human body historically being used as a basis for units of length (such as the cubit, hand, span, digit, and many others, sometimes referred to as anthropic units). This resulted in the measurement of a foot varying between 250 mm and 335 mm in the past compared to the current definition of 304.8 mm. While the United States is one of the few, if not only, countries in which the foot is still widely used, many countries used their own version of the foot prior to metrication, as evidenced by a fairly large list of obsolete feet measurements. a b von Struve, Friedrich Georg Wilhelm (July 1857). "Comptes rendus hebdomadaires des séances de l'Académie des sciences / publiés... par MM. les secrétaires perpétuels". Gallica. p.509, 510 . Retrieved 30 August 2021.

Taylor, B.N. and Thompson, A. (Eds.). (2008a). The International System of Units (SI). United States version of the English text of the eighth edition (2006) of the International Bureau of Weights and Measures publication Le Système International d' Unités (SI) (Special Publication 330). Gaithersburg, MD: National Institute of Standards and Technology. Retrieved 18 August 2008. Current use: The centimeter, like the meter, is used in all sorts of applications worldwide (in countries that have undergone metrication) in instances where a smaller denomination of the meter is required. Height is commonly measured in centimeters outside of countries like the United States. Polar motion | Earth's axis, wobble, precession | Britannica". www.britannica.com . Retrieved 27 August 2023. Science. 1791, l'adoption révolutionnaire du mètre". humanite.fr (in French). 25 March 2021 . Retrieved 3 August 2021.which converts the unit of wavelength λ to metres using c, the speed of light in vacuum in m/s. Here n is the refractive index of the medium in which the measurement is made, and f is the measured frequency of the source. Although conversion from wavelengths to metres introduces an additional error in the overall length due to measurement error in determining the refractive index and the frequency, the measurement of frequency is one of the most accurate measurements available. [126] Delambre, Jean-Baptiste (1749-1822) Auteur du texte; Méchain, Pierre (1744-1804) Auteur du texte (1806–1810). Base du système métrique décimal, ou Mesure de l'arc du méridien compris entre les parallèles de Dunkerque et Barcelone. T. 1 / , exécutée en 1792 et années suivantes, par MM. Méchain et Delambre, rédigée par M. Delambre,... pp.93–94, 10. {{ cite book}}: CS1 maint: numeric names: authors list ( link) The task of surveying the Paris meridian arc took more than six years (1792–1798). The technical difficulties were not the only problems the surveyors had to face in the convulsed period of the aftermath of the French Revolution: Méchain and Delambre, and later Arago, were imprisoned several times during their surveys, and Méchain died in 1804 of yellow fever, which he contracted while trying to improve his original results in northern Spain. In the meantime, the commission of the French Academy of Sciences calculated a provisional value from older surveys of 443.44 lignes. This value was set by legislation on 7 April 1795. [42] [43] [45] [46] [47] Its definition, therefore, applies only within a spatial extent sufficiently small that the effects of the non-uniformity of the gravitational field can be ignored (note that, at the surface of the Earth, this effect in the vertical direction is about 1 part in 10 16 per metre). In this case, the effects to be taken into account are those of special relativity only. Timeline [ edit ] Date According to Alexis Clairaut, the study of variations in gravitational acceleration was a way to determine the figure of the Earth, whose crucial parameter was the flattening of the Earth ellipsoid. After the Anglo-French Survey, the French Academy of Sciences commissioned an expedition led by Jean Baptiste Joseph Delambre and Pierre Méchain, lasting from 1792 to 1798, which measured the distance between a belfry in Dunkirk and Montjuïc castle in Barcelona at the longitude of the Paris Panthéon. When the length of the metre was defined as one ten-millionth of the distance from the North Pole to the Equator, the flattening of the Earth ellipsoid was assumed to be 1 / 334. [22] [23] [24] [25] [26] [27]

Guedj, Denis (2001). La Mesure du Monde[ The Measure of the World]. Translated by Goldhammer, Art. Chicago: University of Chicago Press.a b Bessel, Friedrich Wilhelm (1 December 1841). "Über einen Fehler in der Berechnung der französischen Gradmessung und seineh Einfluß auf die Bestimmung der Figur der Erde. Von Herrn Geh. Rath und Ritter Bessel". Astronomische Nachrichten. 19 (7): 97. Bibcode: 1841AN.....19...97B. doi: 10.1002/asna.18420190702. ISSN 0004-6337. Hassler, Harriet; Burroughs, Charles A. (2007). Ferdinand Rudolph Hassler (1770-1843). NIST Research Library. pp.51–52. Huet, Sylvestre. "Einstein, le révolutionnaire de la lumière". Libération (in French) . Retrieved 7 October 2023. Our cube shelves are great for all rooms, offering both modular storage cube units and wall hanging cubes for a contemporary look.

Hyperfine atomic transition; 1 650 763.73 wavelengths of light from a specified transition in krypton-86 (11th CGPM)If you are a martial arts fanatic, you may know that a Katana, which is the most famous samurai sword, is about a meter long. Traditionally, the length of a Katana is measured in shaku and its 3.5 shaku. That said, different types of guitars may vary slightly in length, shape, weight, and size. 6. Width of Door Frame