"Once in a blue moon there actually is a blue moon. There'll be a so-called blue moon around for the New Year's countdown on Thursday. According to popular definition, a blue moon is the second full moon in a month. But don't expect it to be blue - the name has nothing to do with its color.This month's first full moon occurred." on Dec. 2. On New Year's Eve, a full moon will be visible in the United States, Canada, Europe, South America and Africa." Source: AP News