The expression “Once in a blue moon” means that something is very rare. In astronomy, it means the third full Moon in a season with four full Moon or the second full Moon in a calendar month.

We experienced a blue moon on Friday, July 31, 2015.  I was in France but friends back home sent me photos of the moon that night. They were so dreamy, I wanted to share them with you.

Photo taken by Howard Greenberg in the Hamptons 

The next three were taken by Marilyn Scher on the roof of my New York coop. 

   
   
Sharing signs are fun too.