[time-nuts] Re: Derivation of time from celestial sight

[Bruce Griffiths]

The Danjon astrolabe typically achieved a timing precision of around 25millisec or so. 
Manually timing transits with a stopwatch will be better than a second but somewhat worse than the Danjon astrolabe.

Bruce
> On 28/12/2021 22:42 David Taylor via time-nuts <time-nuts at lists.febo.com> wrote:
> 
>  
> On 27/12/2021 20:18, Brent wrote:
> > My understanding (and I could be wrong) is that one could derive 'stellar'
> > time from a start sight/fix on polaris or another well tracked celestial
> > object.  I was once told that early editions of Bowditch provided the
> > process (for the moon I was told) although one of the relatively old
> > edition's that I have doesn't provide it.
> 
> My previous answer mentioned precision, of course, not accuracy.  And the error 
> I mentioned was not the error in GPS which places the zero degree meridian some 
> 102m east of Greenwich!
> 
> David
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