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Frank Reed wrote-

| So the daily observations might be something like this:
| At noon, determine latitude by Noon Sun. Call out the moment, and
reset all
| pocket watches to noon. This is a good way to get latitude, but an
inferior
| way  to get local time, at least for navigational purposes.

I am aware that Frank Reed has been advocating the use of observations
around noon to determine the moment of noon for some time, and have no
wish now to rehearse once again the weaknesses in that procedure. As
he says, it's an inferior way to get local time. To achieve any
precision, it needs a wide bracket of equal altitudes, before and
after noon.

What, then, would be the procedure for discovering the moment of noon
AT noon, in such a way that the moment of noon can be "called out"?
That makes any bracketing, around noon, impossible. How would that
procedure cope with any North-South component of the vessel's speed,
and the changing declination of the Sun? And what would be the
expected level of precision in the result?

George Huxtable.

contact George Huxtable at george@huxtable.u-net.com
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.


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