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Geoffrey S. Mendelson · August 11th 11, 08:39 AM posted to rec.radio.shortwave

wrote:

Egypt,Sumer etc . all had calendars and sundials . Nothing unusual
here ; standard time was imperative/mandatory/necessary for
navigational purposes --hence England and GMT . BTW, what type of
clocks are good enough for space travel ?

Standard time was invented for railroads, celestial navigation only
requires GMT, as you can guess your longitude by where the sun is
in relation to where it would be if you were at the prime meridian
(GMT).

You can guess your latitude by where the sun is in relation to where it would
be at the equator, e.g. noon would be directly overhead.

Geoff.

--
Geoffrey S. Mendelson N3OWJ/4X1GM
Making your enemy reliant on software you support is the best revenge.