In article <web.45c55920e46e4f74442464bf0@news.povray.org>,
 "waggy" <hon### [at] handbasketorg> wrote:

> So, does anyone have any idea how accurate the sunpos macro is for historic
> or prehistoric dates?  I am specifically interested in how much error to
> expect in the sun's position during the first thirty minutes after sunrise
> on the morning of the Winter Solstice, say during year -3000 at the

> 
> Also, is there a handy way to determine on which day the solstice occurred
> during that year?
> 
> I'm hoping to be able to illustrate, with a nice POV-Ray animation, the
> exceptional service life of Newgrange during a presentation for my civil
> engineering practice course.

sunpos is too "simple" to give good results. but the web give you a lot 
of sites as "institut de mecanique celeste et de calcul des ephemerides" 
<http://www.imcce.fr/imcce.php?lang=en> (the english version)

try the "ephemeris generator" :))




-- 
klp

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