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    Re: equinox
    From: Trevor Kenchington
    Date: 2004 Mar 21, 09:26 +0000

    Fred,
    
    Of course you are right.
    
    Having converted the time from GMT to LMT for 72degrees West, in order
    to respond to your original longitude figure, I ended up looking in the
    almanac for GHA under 0248, which was the zone time of the equinox for
    my time zone (Z+4) -- and hence the first time I had seen quoted, long
    before your first posting. A very silly mistake.
    
    The almanac makes the GHA for 0648 GMT on March 20 as 280degress 8.4'. I
    suspect the difference from your figure is the rounding error in the
    almanac's estimate of the instant of zero declination. So I agree with
    your longitude -- which is that of Colombo (Sri Lanka) or Madras.
    
    
    While correcting my mistakes: I previously described 139degrees 52.3'
    East as approximately the longitude of Adelaide, which it is. Had I been
    a bit less anglo-centric, I should have noted that it is also the
    approximate longitude of Tokyo.
    
    
    Trevor Kenchington
    
    
    
    You wrote:
    
    > I get a GHA of 280degrees 8.56', which would be a longitude of
    > 79degrees 51.44' East.
    
    
    --
    Trevor J. Kenchington PhD                         Gadus{at}iStar.ca
    Gadus Associates,                                 Office(902) 889-9250
    R.R.#1, Musquodoboit Harbour,                     Fax   (902) 889-9251
    Nova Scotia  B0J 2L0, CANADA                      Home  (902) 889-3555
    
                         Science Serving the Fisheries
                          http://home.istar.ca/~gadus
    
    
    

       
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