Also check out:
http://www.sundog.clara.co.uk/atoptics/sunflat.htm
Tom C.
From: Bob Sullivan <[EMAIL PROTECTED]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: Distortion low on the horizon
Date: Mon, 26 Sep 2005 08:02:23 -0500
Rob,
It has to be that thin layer of atmoshpere we live under.
The air on this ball is only 20-30 miles deep, and
the first 5 miles are a lot denser than the 2nd 10 miles.
(Not much on a ball 8,000 miles in diameter!)
Most of the time, you look thru 1 thickness of atmosphere, straight up,
but...
If you get the angle right, you've got to be using the air as a lens.
You are looking thru a lot more air at the horizon,
than at just one Sun diameter above the horizon.
I suspect that is how the sun starts to look oval.
Regards, Bob S.
On 9/26/05, Rob Studdert <[EMAIL PROTECTED]> wrote:
> Does anyone know the technical reason that the sun renders as an ellipse
when
> shot close to the horizon?
>
> TIA.
>
>
> Rob Studdert
> HURSTVILLE AUSTRALIA
> Tel +61-2-9554-4110
> UTC(GMT) +10 Hours
> [EMAIL PROTECTED]
> http://members.ozemail.com.au/~distudio/publications/
> Pentax user since 1986, PDMLer since 1998
>
>
