The Geminid meteors are named for the constellation Gemini (Mithuna), because the radiant point of this shower lies in front Gemini, closely aligning with the bright star Castor. If you trace all the Geminid meteors backward, they all appear to originated from this constellation. Our planet Earth crosses the orbital path of a mysterious object called 3200 Phaethon, which might be an asteroid or a burnt-out comet orbiting our sun. Debris from this object burns up in the Earth’s upper atmosphere to give us the annual Geminid meteor shower.
Observe Mercury @ west this month setting 80- 90 minutes after the sun by late December. Mercury reaches its greatest elongation from the sun Dec 28/ 29. Binoculars will help out with your Mercury quest. Mercury will be well placed for viewing for a few weeks, centered on this date. Mercury will swing back into the morning sky on January 14, 2016.