An Astronomer's December.
Celestial Events in December 2025 Plenty to see this month, but as always, wrap up warm and especially make sure your boots and hat are Super Ninja North Pole Thermal quality . December 4 (evening): Full Moon (Cold Moon). The last full Moon of the year will also be a supermoon, meaning it is at its closest point to Earth in its elliptical orbit (perigee), making it appear up to 14% bigger and 30% brighter than when it is farthest away. It will occur at 23:14 GMT. December 7th: Mercury at Greatest Western Elongation & Jupiter at Opposition. Mercury will reach its greatest western elongation, appearing at its farthest point from the Sun in the morning sky. This, coupled with Jupiter being at opposition (closest to Earth and fully illuminated), should make for good planetary viewing, especially in the early morning. December 4th–20th: Geminid Meteor Shower Active. The Geminids, one of the most reliable and spectacular meteor showers, are active during this period. December ...
