New Year’s Eve Blue Moon 30 Wednesday Dec 2009 Posted by Dagny Gromer in Misc. ≈ Leave a comment Tagsblue moon, newyear's eve 2009 “Once in a blue moon” means something that rarely occurs. A blue moon is the second full moon in one month. Yes, we will have one of these on New Year’s Eve. The first full moon in Dec. 2009 was on 12/2/2009. Here’s a link.