Editing Jean Fernel (section)

===Astronomy and geodesy{{anchor|Arc measurement}}===
Fernel's ''Cosmotheoria'' (1528) records a determination ([[arc measurement]]) of a degree of [[arc of the meridian]], which he made by counting the revolutions of his carriage wheels on a journey between Paris and [[Amiens]].<ref name=EB1911/> Using his measurements he calculated the [[circumference of the earth]] to within one percent of the correct value. He computated a degree of a [[Meridian (geography)|meridian]] would have been long 56,746 [[toise]]s instead of the 57,024 that were subsequently measured.<ref>{{cite journal|first1=David Eugene|last1=Smith|author-link1=David Eugene Smith|title=Medicine and Mathematics in the Sixteenth Century|pmc=7927718|pmid= 33943138|journal=Ann. Med. Hist.|date=July 1, 1917|volume= 1|issue=2|pages=125–140|oclc=12650954}} (here cited p. 131).</ref> His works on mathematical and astronomical subjects also include ''Monalosphaerium, sive astrolabii genus, generalis horarii structura et usus'' (1526), and ''De proportionibus'' (1528).