December 2025 Skies: Supermoon, Meteor Showers, and the Winter Solstice Await
A spectacular array of astronomical events will grace the December 2025 skies, from a brilliant supermoon to the peak of the Geminid meteor shower and the arrival of winter. Skywatchers around the globe are poised for a month of celestial wonders.
December will begin with a captivating supermoon on December 4th, offering a particularly stunning lunar display. A supermoon occurs when a full moon coincides with the moon’s closest approach to Earth in its orbit – a point known as perigee. According to NASA, the moon reaches perigee approximately every 27 days, at a distance of around 363,300 kilometers (225,700 miles) from Earth, compared to its farthest point, or apogee, at 405,500 kilometers (252,000 miles).
The December 4th supermoon, often referred to as the Full Cold Moon, will appear 7.9% larger and 15% brighter than a typical full moon. It will be positioned within the constellation Taurus, offering a beautiful backdrop to this lunar spectacle. While the full moon phase is fleeting, lasting only a moment when directly opposite the sun relative to Earth, the moon will appear fully illuminated the days before and after this precise alignment.
Beyond the Supermoon: A December Sky Full of Wonders
But the supermoon is just the beginning. December 2025 promises a wealth of other astronomical phenomena. Here’s a closer look at the key events:
Best Time to Observe Mercury: On December 7th, Mercury will reach its greatest elongation to the west, meaning it will appear at its farthest visible distance from the sun. This event, where the angle between Mercury and the sun reaches 20°42′, provides the optimal viewing opportunity for this often-elusive planet.
Moon and Jupiter Alignment: Also on December 7th, observers will be able to spot the 89% illuminated Moon in close proximity to Jupiter in the constellation Gemini. Both celestial bodies will be visible to the naked eye or through binoculars.
Geminid Meteor Shower Peak (December 13-14): The Geminid meteor shower is renowned as one of the most spectacular of the year, known for its bright, abundant, and slow-moving meteors. In 2025, viewing conditions are expected to be particularly favorable due to the waning crescent moon. For those north of the equator, the radiant point of the shower will rise around sunset, allowing for observations throughout the night. Observers in the Southern Hemisphere can expect peak activity around midnight local time, reaching its maximum around 2:00 AM.
New Moon (December 20): The New Moon will occur on December 20th at 01:43 GMT. During this phase, the moon is positioned between the Earth and the sun, with its illuminated side facing away from our planet. This makes it the ideal time for stargazing, as the lack of moonlight creates exceptionally dark skies.
December Solstice (December 21): The December solstice, occurring on December 21st at 15:03 GMT, marks the official start of astronomical winter in the Northern Hemisphere and summer in the Southern Hemisphere. This event signifies the shortest day of the year for those in the north and the longest day for those in the south.
December 2025 promises to be a remarkable month for astronomy enthusiasts, offering a diverse range of celestial events to captivate and inspire.
