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S&T: Lauren Darby

Do you know what a "Blue Moon" is? You'll often hear it applied to the second full Moon in a single month. We'll get two of those in December — but the real definition for "Blue Moon" might surprise you.

Meanwhile, December features Jupiter getting low in the southwest, flanked to its right by the three stars of the Summer Triangle, making their last stand before disappearing from evening view until next year.

Looking farther east, you'll learn to spot the Orion, his two canine companions, the planet Mars, and the Pleiades star cluster.

Get all these details and more by downloading December's audio sky tour. It's an 8-megabyte MP3 file that runs 8 minutes long.


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