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I am trying to use a theodolite with which I am trying to take precision
sightings on stars, but a limiting factor is that virtually all quartz
clocks/watches only tick off the whole seconds, which immediately limits me
to 0.25 minutes of longitude.

Is there a stopwatch out there that can be set to GMT so will act as a
chronometer over a period of weeks or months, but has a feature where a
button can be pressed  and the display will show the time at which the
button was pressed to a tenth of a second or better? Then, at another press
of a button, current time is displayed once again in the normal way.

Thanks.

Geoffrey Kolbe


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