Telegraphic Longitudes

  • James Lequeux
Part of the Astrophysics and Space Science Library book series (ASSL, volume 397)


It is easy to determine the latitude of a location by observing the height above the horizon of the Sun or of a star whose position is known, as it passes the meridian, but the determination of longitude has for a long time given geographers and navigators headaches (see Box 8.1). It was the problem of longitudes which occasioned the foundation of the Greenwich Observatory in the seventeenth century, and in France that of the Bureau of longitudes during the Revolution.


Astronomical Observation Submarine Cable Paris Observatory Stellar Occultation Cross Hair 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. Documents divers sur l’Observatoire de Paris, 1854–1872, réunis par G. Bigourdan, Bibliothèque de l’Observatoire de Paris, cote 3567 (3), (4) et (6)Google Scholar
  2. Lequeux, J.: François Arago, un savant généreux; physique et astronomie au XIXe siècle. Les Ulis et Paris, EDP Sciences et Observatoire de Paris (2008)Google Scholar
  3. Levallois, J.-J.: Mesurer la Terre – 300 ans de géodésie française. École des Ponts et Chaussées/Association Française de Topographie, Paris (1988)Google Scholar

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • James Lequeux
    • 1
  1. 1.Paris ObservatoryParisFrance

Personalised recommendations