Re: Re: VMs: Analysis of f67v2

[Pamela Richards <spirlhelix@xxxxxxxxx>]

Hi, Greg!

Thank you!  This is what I was attempting to say in
part; that in the Northern hemisphere in winter, as
you cite in your example, the Sun sets less than 180
degrees from its point of rising.  And it is
interesting to observe that latitude is also a factor
to consider; it would be wonderfully useful if we
could hone in on the latitude of the VMs illustrator
by examining these factors against the planetary
configurations described.

Warmly,

Pam



--- Greg Stachowski <greg@xxxxxxxxxxxxxxxxxxxxxx>
wrote:

> 
> Hello, Jan, Larry, Pamela!
> 
> On Sat, 22 Jan 2005, jan wrote:
> 
> > SE to SW is
> > only 90  degrees in my book,
> 
> Hmm, not sure where my earlier mail to the list
> went, nobody seems to have 
> noticed it ;)
> 
> Anyway, as Elmar has correctly pointed out, the sun
> rises and sets
> symmetrically relative to _true_ north and a flat
> horizon. If the
> positions are measured relative to _magnetic_ north
> then the symmetry will
> not occur, as the direction of the magnetic pole is
> offset from true
> north, in some places by as much as 25 degree.
> 
> Also, the angle between the positions at which the
> sun sets need not be
> 180 degrees, depending on latitude and season; in
> winter the angle will be
> much less. For example, for Prague the minimum angle
> is only 103 degrees 
> (in late December).
> 
> Theres a good explanation, tutorial and calculator
> at:
> 
> http://www.locationworks.com/sunrise/tutor.html
> http://www.locationworks.com/sunrise/instruct/
> http://www.locationworks.com/sunrise/ssr.html
> 
> Cheers,
> 
> Greg
> -- 
>
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> 
> 
> 
> 
>
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=====
"I'd rather learn from one bird how to sing, than to teach ten thousand stars how not to dance."


		
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