Re: Jet lag without leaving home

On 2008-03-21, Keith F. Lynch <kfl@[EMAIL PROTECTED]
> wrote:
> Aaron Denney <wnoise@[EMAIL PROTECTED]
> wrote:
>> Ah, well part of the problem must be that you're living offset from
>> the center of the timezone.  At the center, if the sun rises near 4
>> am, it must set near 8 pm.
>
> Only when averaged through the year.  The sun gets as much as a quarter
> hour ahead or behind.  See http://en.wikipedia.org/wiki/Equation_of_time

I hadn't realize eccentricity and inclination made such a difference.
(15 minutes difference between mean solar time and apparent solar time).
It's still only half that required to get an offset of an hour, as Jette
described.  I'd expect mountains to make a more practical difference in
many places.

-- 
Aaron Denney
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