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Determinations of the difference in longitude between the Greenwich and Paris Observatories and beween Greenwich and elsewhere

 

Page under construction

Over the years, numerous different determinations were made of the difference in longitude between Greenwich and Paris and Greenwich and elsewhere. At present, this is very much a holding page where information is being collated as time allows prior to a more comprehensive write up.

 

The Greenwich - Paris longitude deterrminations

1825: Determination by John Herschel using chronometers and rocket flares

1837: Determination by Edward J Dent using 12 chronometers (MNRAS, Vol. 4, p.101-102 (1838) & MNRAS (full account})