1) Atmospheric optical phenomena
Found on
https://www.crosswordclues.com/clue/subsun
A subsun or sub-sun is a glowing spot seen within clouds when the clouds are observed from above. The subsun appears directly below the sun, as if it were caused by sunlight reflecting from a body of water. The reflection is caused by large numbers of flat ice crystals. Unless disturbed by turbulence, flat ice crystals such as snowflakes will orie...
Found on
http://en.wikipedia.org/wiki/Subsun
No exact match found.
