From the "flower moon" to the "buck moon," each version has a distinct cultural and astrological meaning. Maybe you've heard the saying, "Once in a blue moon." The colloquialism refers to the rare ...

The famous saying “once in a blue moon” officially happened on Wednesday, Aug. 30, as spectators took in the bright full moon. The term "blue moon" has been ingrained in popular culture ...

As soon as it gets dark this Monday, Aug. 19, look up to experience a celestial event that occurs only once this year: a blue moon. What, exactly, is a blue moon? Is it really blue? And how did the ...