Editing Nevil Maskelyne (section)

===Measurement of latitude===
Maskelyne took a great interest in various [[geodetics|geodetical]] operations, including the measurement of the length of a degree of latitude in [[Maryland]] and [[Pennsylvania]],<ref name="PTRS323">Philosophical Transactions of the Royal Society. lviii. 323</ref><ref name=EB1911/> executed by [[Charles Mason|Mason]] and [[Jeremiah Dixon|Dixon]] in 1766 – 1768, and later the determination of the relative longitude of [[Greenwich]] and Paris.<ref name="PTRS151">Philosophical Transactions of the Royal Society. lxxvii. 151</ref><ref name=EB1911/> On the French side the work was conducted by [[Dominique, comte de Cassini|Count Cassini]], [[Adrien-Marie Legendre|Legendre]], and [[Pierre Méchain|Méchain]]; on the English side by [[William Roy|General Roy]]. This triangulation was the beginning of the [[Principal Triangulation of Great Britain|great trigonometrical survey]] which was subsequently extended all over Britain. His observations appeared in four large folio volumes from 1776 to 1811,<ref name=EB1911/> some of them being reprinted in [[Samuel Vince]]'s ''Elements of Astronomy''.<ref>{{cite book | last = Vince | first = Samuel | author-link = Samuel Vince | title = The Elements of Astronomy: Designed for the Use of Students in the University | publisher=J. Smith | year = 1811 | url =https://archive.org/details/elementsofastron00vincrich}}</ref>