Gerhard,

On Thu, 24 Aug 2006 10:16:07 -0300, Gerhard Fiedler wrote:

> Howard Winter wrote:
> 
> > On Wed, 23 Aug 2006 01:11:12 +1200, Russell McMahon wrote:
> > 
> >> ASSUME sun intensity varies by sine of angle across day.
> 
> > That would only apply if there was no atmosphere - the added thickness of
> > air and pollution that the light travels through either side of noon
> > mean that there is much less energy available than the above calculates
> > [...]
> 
> Isn't that for what Russell used the sine as approximation (differences in
> intensity between horizon and noon positions)?

I didn't spot that!  I'm not sure why a sine would be the right shape for this, but does it account for the fact that the atmoshphere is curved?

Cheers,


Howard Winter
St.Albans, England


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