[time-nuts] Time-zones and World time..

Sanjeev Gupta ghane0 at gmail.com
Sat Nov 1 22:50:12 UTC 2008


On Sun, Nov 2, 2008 at 4:49 AM, Hal Murray <hmurray at megapathdsl.net> wrote:

> > Don't forget too, that solar noon varies quite a bit (minutes) from
> > "mean solar time" over the year.  If you're navigating your ship with
> > noon sun sights, this is pretty important.
>
> What do I google for if I want that correction?
>

Equation of Time.  http://en.wikipedia.org/wiki/Equation_of_time


> There are quite a few time scales.  Which one do navigators use?
>

Whichever were used in the almanac they are using.  That is the point of the
almanacs and compilations of tables, to have "reference frames" in which
(nearly) pre-computed solutions are listed.


-- 
Sanjeev Gupta
+65 98551208



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