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Glorious rival to Greenwich

How the Paris Meridian was established and why London does not keep Paris Mean Time.

The Paris Meridian is the name of the line running north-south through Paris, surveyed by the scientists of the Paris Academy of Sciences during the French Revolution and the Napoleonic Wars in order to determine longitude - just as the Greenwich meridian was. Professor Paul Murdin of the Royal Astronomical Society and Institute of Astronomy, Cambridge, explains why this was so important and why the Paris Meridian lost out when America insisted that it was time to choose the Prime Meridian of the world.


Professor Paul Murdin | talks | www


Date and Time:

12 January 2009 at 12:30 pm


1 hour 30 minutes



Royal Astronomical Society
Burlington House

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Free after 1230 on the day

Available from:

Reception at the Royal Astronomical Society

Additional Information:

Tube: Green Park
Tel: 020 7734 3307
Seats may be reserved in advance by Friends of the RAS and remaining seats will be offered on the day on a first-come first served basis. Doors open from 12.30.

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