• The moon might look full tonight as it shines fairly close the constellation Gemini's brightest stars, Castor and Pollux, this early evening. But the moon won't be astronomically full - most opposite the sun - tonight. For us in North America, the full moon will occur during the nighttime hours tomorrow, on Saturday, January 26. Tonight's moon is actually a waxing gibbous moon.

• Although we draw in the stick figure of the Gemini Twins on tonight's chart, you won't see much of Gemini in the moonlight except for Castor and Pollux. Tonight's moon beams roughly midway between Gemini's two brightest stars and the star Procyon, the three stars that define the east side of the Winter Circle.
• In a week or so - after the moon drops out of the evening sky - look for Gemini to shine in all its starlit majesty. If you're familiar with the winter constellation Orion, draw an imaginary line from the star Rigel through the star Betelgeuse to locate Castor and Pollux.
• You can also use the Big Dipper to locate the Gemini stars, Castor and Pollux. Draw an imaginary line diagonally through the bowl of the Big Dipper, as shown on the sky chart on the right.
• Let the full-looking waxing gibbous moon guide your eye to the bright Gemini stars, Castor and Pollux, tonight!
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