Starts with a Bang! is one of my must-read blogs. Ethan Siegel is a quirky theoretical astrophysicist.
Recently Siegel tackled the phenomenon known as “Blue Moon”. If you have any curious bone in your body, you’ll go read about it. A blue moon is not what you think it is. Or at least, not in the way an astrophysicist says it is.
You should spend a little time over there at SWAB. There was a post about Saturnalia that preceded the blue moon post.