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    Longitude of Greenwich Observatory
    From: Frank Reed CT
    Date: 2005 Dec 17, 23:55 EST

    When you visit the old Royal Greenwich  Observatory, you can stand in line
    with the transit instrument's  building and put one foot on either side of a
    stripe in the paving stones  and get your photo taken "with one foot in East
    longitude and one foot in West".  My question is, with various revisions and
    refinements in the geodetic system,  is that precisely true today? That is, does
    zero degrees longitude still pass  right through that transit instrument's
    original mounting point by  definition?
    
    For fans of Google Earth (and if you're not a fan, you will  become one when
    you try it out!), the longitude displayed for this location is  0d 0' 05.36"
    W. Pretty close to zero, and I assume that the difference is  nothing more than
    the usual difficulty of registering aerial photography exactly  in lat/lon,
    but maybe the old RGO is drifting... By the way, if you go down to  the river
    from here in Google Earth, you can see the spars and even the shadows  of the
    shrouds on Cutty Sark.
    
    If you want Google  Earth:
    http://earth.google.com/
    
    And coincidentally, the lead story on  Sky & Telescope's web site this week
    is about the renovations and expansion  of exhibits at Greenwich:
    http://skyandtelescope.com/
    
    -FER
    42.0N  87.7W, or 41.4N 72.1W.
    www.HistoricalAtlas.com/lunars
    
    
    

       
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