The Griffith Observatory is holding a public and online viewing of something called the "major standstill northern moonrise" on early Sunday evening. So what is it exactly?

December's full moon also coincides with the peak of the Geminid meteor shower, which should be most active on the night of Dec. 13.

The “cold moon” - a phenomenon that happens every 18.6 years - will rise at 3.20pm (GMT) on Sunday and set at 9.44am (GMT) on ...

Something that occurs every 18.6 years is happening again on Sunday afternoon. It's called a "major lunar standstill." What's ...