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See:

http://www.nmm.ac.uk/explore/astronomy-and-time/astronomy-facts/history/the-longitude-of-greenwich

-- Richard Langley

Quoting Scott O'Connor :

> I recently stood astride the Prime Meridian at Greenwich and fired
> up my Garmin Nuvi GPS. The coordinates read  N 51 28.674'  W 000
> 00.088'.  Why the error? Is this due to nutation wobble?  If so,
> when would it read exactly zero?  How far off is this in nautical
> miles?  It would appear to be far too minimal to consider for
> celestial nav work with a sextant, but is this a consideration?
> thanks very much.
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===============================================================================
  Richard B. Langley                            E-mail: lang@unb.ca
  Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
  Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142
  University of New Brunswick                   Fax:      +1 506 453-4943
  Fredericton, N.B., Canada  E3B 5A3
      Fredericton?  Where's that?  See: http://www.city.fredericton.nb.ca/
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