I have never seen it

[Rothkko]

I have no idea why there is that shadow ... and you?
No tengo ni idea de por qué se produce esa sombra... y tú?

Mosaic 8 photos, 180º

Alange, Spain. 2012-09-01

[owlice]

One of the clouds is blocking the sunlight; nothing more than that. Here's another example: http://www.atoptics.co.uk/atoptics/clshad.htm

[Rothkko]

nothing more than that. Here's another example http://www.atoptics.co.uk/atoptics/clshad.htm

He had seen many rays and anti-crepuscular rays, but always with the sun above the horizon, as in the image links kindly, but never 20 minutes after having crossed. This, coupled with one of the threads of the clouds in the first escapes the shadow cone appear illuminated, made ​​me wonder.
Había visto muchos rayos y anti-rayos crepusculares, pero siempre con el Sol por encima del horizonte, como en la imagen que amablemente me enlaza, pero nunca 20 minutos después de haberlo cruzado. Esto, sumado a que uno de los hilos de las nubes en primer término se libra del cono de sombra y aparece iluminado, me hizo dudar.

[owlice]

Here are two APODs which show cloud shadows, one at sunset and one at sunrise:
http://apod.nasa.gov/apod/ap101204.html
http://apod.nasa.gov/apod/ap020227.html

[Rothkko]

http://apod.nasa.gov/apod/ap101204.html
http://apod.nasa.gov/apod/ap020227.html

thanks