Blue Moon

[joe.s-b]

Why is the blue moon called blue. I know what it is and why it occurs but why blue?

[Canary42]

http://www.telegraph.co.uk/news/science/space/11775016/Rare-super-Blue-Moon-to-light-up-summer-night-sky.html

[Jonathan-Joe]

According to this http://www.worldwidewords.org/topicalwords/tw-blu2.htm it's complicated.

[joe.s-b]

Thanks for the contacts. I am slightly less confused than I was so will never certainly know. I give up.