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Alexandre Eremenko wrote:

> If Ptolemy and Brahe did not use water clock,
> then what did they use for the timing?

The sky.

Brahe measured star (or sun) altitudes simultaneously with the event to
be timed. Cook still did the same for his transit and eclipse
observations. It's good to have an assistant for this. And you can do it
that way for lunar distances if you loose your watch. You can find time
and position simultaneously. (But the information won't do you much good
at sea without a watch).

Herbert Prinz

   

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