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I've just been delving into "Lunar Distance (Navigation)" in Wikipedia, and
can quote this little gem-
"[edit] Theory
If there are two people, one at Greenwich and one 15 degrees West, the time
by the sun will be one hour later at 15 degrees West. So, if the person
observes the position of the moon at Greenwich at noon and another person
observes the moon 15 degrees west of Greenwich at their locally determined
noon, then due to the one hour difference, although the sun is at its
zenith, the moon would have moved approximately its own diameter across the
sky."

=========================

Just checking that I'm not making a silly error here. At the same moment,
when the time by the Sun is noon for the observer at Greenwich, then for the
observer at 15 degrees West, won't the Sun still be climbing up the sky? And
so, won't his time by the Sun at that moment be 11 am, one hour earlier,
rather than one hour later?

Looking at it another way, however, when it's noon for the observer at
Greenwich, it won't be noon for the observer at 15 degrees West until an
hour later.

I thought I understood the matter, but now I am thoroughly confused. What is
the fellow trying to tell us? I wonder who wrote it?

George.

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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