RE: [APML] Earthshine

[Glenn Ray <Glenn.Ray@aspentech.com>]

Crepuscular rays are shadows projected into the air by anything...clouds,
mountains, trees.  When projected by terrain, they're not always visible to
the horizon because of the shadow often passes through various levels of
twilight (like in your image).

Here's an example of crepscular rays that aren't visible to the horizon.
Very subtle.

http://www.weather-photography.com/Atmospheric_Optics/HTML/w-061-19.html

-Glenn "not crepuscular" Ray

-----Original Message-----
From: Matt BenDaniel [mailto:matt@starmatt.com]
Sent: Friday, November 02, 2001 10:41 AM
To: astro-photo@seds.org
Subject: RE: [APML] Earthshine


At 09:27 AM 11/2/2001 -0600, Glenn Ray wrote:
>Maybe it's a crepuscular ray.  

Glenn,

I guess you're any expert on "Rays"<g>

I've read about crepuscular rays in "Color and Light in Nature". 
They are the shadows of clouds on the air.
Wouldn't the shadow be visible all the way down to the horizon?

>At that focal length, you might not be able
>to detect any convergence that one might normally see in a wide-angle view.
>
>Good catch, Stan.  I didn't even notice it until I shut off the lights to
my
>room and viewed the monitor in the dark.
>
>Glenn Ray
>Cypress, TX
>
><g> Oh, and by the way, I think it's a fantastic shot Matt.  A higher focal
>length wouldn't have the composition this one does.

Actually what's on my web site is a small crop of the medium format slide.

http://people.ne.mediaone.net/mbendaniel/gallery/astro/earthshine.html
--
Matt BenDaniel
http://starmatt.com


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