Sun dogs and crepuscular rays

Question

What kind of conditions permit the observing of “sun dogs” (mock suns) and “crepuscular rays?”

Answer 1

The web-site called "Atmospheric Optics" is often referenced by spaceweather.com on these matters.

Answer 2

Uniform layers of ice crystals in clouds, I believe.

Answer 3

sun dogs usually form when there is ice in the atmosphere.

so... winter, just before sunset, is a good time.

Answer 4

Try this link:

http://hyperphysics.phy-astr.gsu.edu/Hba...

it explains all those things and more...