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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.


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Trevor J. Kenchington PhD                         Gadus@iStar.ca
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