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On 2015-11-08 9:27, Mark Coady wrote:
> On the down side:
> 1. It adds a data step.  Adding stopwatch time to clock time.  Adds a chance for recording error.

To the contrary, I think a blunder is more likely if you record the time
when you make the observation. If you make a mistake there's no remedy
except to guess what you did wrong. With stopwatch you need only punch a
button. All the rest of the work is done indoors at leisure.

> 2. I have forgotten to write the start time.

That happens, or maybe you're in a hurry and there's no time to hack the
watch before the observation. No problem. Start the watch at the first
observation and take splits at the other observations, if any. Before
you reduce the sights, take a split on WWV at the top of a minute, and
record the UTC of that split. Subtraction gives you the UTC at watch start.

In any case, NEVER stop the watch until the sights are reduced and
you're satisfied with the results. If there's doubt the start time was
correctly recorded, you can take a split on WWV to confirm. In fact,
that check is always good practice.

   

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