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Arc measurement
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=== Chronological list === This is a partial chronological list of arc measurements:<ref>{{cite book | title=A history of the determination of the figure of the earth from arc measurements |author= Butterfield, Arthur Dexter | publisher=Internet Archive | date=1906 | page=156 | url=https://archive.org/details/ahistorydetermi00buttgoog/page/n168/mode/1up | ref={{sfnref|Internet Archive|2016}} | access-date=2025-01-26}}</ref><ref>{{cite web | title=Arc Measures | website=International Institution for the History of Surveying and Measurement | url=https://www.fig.net/organisation/perm/hsm/history_of/measurements/arc.asp | ref={{sfnref|International Institution for the History of Surveying and Measurement}} | access-date=2025-01-27}}</ref> * 230 B.C.: [[Eratosthenes' arc measurement]] * 100 B.C.: [[Posidonius' arc measurement]] * 724 AD: [[Yi Xing's arc measurement]] * 827 A.D.: [[Al-Ma'mun's arc measurement]] * 1528: [[Fernel's arc measurement]] * 1617: [[Snellius' survey]] * 1633-1635: [[Norwood's arc measurement]] * 1658: [[Riccioli and Grimaldi's arc measurement]] * 1669: [[Picard's arc measurement]] * 1684-1718: [[Dunkirk-Collioure arc measurement (Cassini, Cassini, and de La Hire)]] * 1736-1737: [[French Geodesic Mission to Lapland]] * 1735-1739: [[French Geodesic Mission to the Equator]] * 1740: [[Dunkirk-Collioure arc measurement (Cassini de Thury and de Lacaille)]] * 1750-1751: [[Maire and Boscovich's arc measurement]] * 1752: [[De Lacaille's arc measurement]] * 1791-1853: [[Principal Triangulation of Great Britain]] * 1792-1798: [[meridian arc of Delambre and Méchain]] * 1802–1841: the [[Great Trigonometric Survey of India]] * 1806-1809: [[Arago and Biot's arc measurement]] * 1816-1855: [[Struve Geodetic Arc]] * 1821-1825: [[Gauss' geodetic survey]] * 1841-1848: [[Maclear's arc measurement]] * 1879: [[West Europe-Africa Meridian-arc]] * 1899-1902: [[Swedish–Russian Arc-of-Meridian Expedition]] * 1921: [[Hopfner's arc measurement]]
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