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George Huxtable wrote, concerning timing sunsets:

>  But on second thoughts, does that matter a jot?. No, it isn't a coastal
>  site, it's an ocean site, as far as sunset timings are concerned. Those are
>  only affected by what's going on in the atmosphere, further out than that
>  distant horizon. Atmospheric effects, between that horizon point and the
>  observation point, have no effect at all, inversions or not, because they
>  bend light from the Sun upper-limb and light from the horizon in EXACTLY the
>  same way. If I've got that right, the only relevant temperature profiles
>  would be those taken from 50 to say 150 miles out to sea. If Marcel knows of
>  such information, it could be of interest."

I think the refraction between the observer and his horizon *does*
make a bit of difference in how sunsets are timed.  Specifically, it
affects how distant that horizon actually is, and therefore affects
the direction of the light-ray that just grazes the ocean surface.
How big is this effect?
    -- Bill N

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