Night Sky Tonight, December 4, 2025: Cold Supermoon, Geminids Begin and Northern Lights Possible
The night sky on Thursday, December 4, 2025 is unusually busy. Skywatchers around the world are getting: Below is your complete, news-driven guide to what’s happening, why it matters, and how to see it tonight, wherever you are. 1. Cold Supermoon 2025: Last Full Moon of the Year Goes Big Exact timing and why this full moon is special Tonight’s full moon is both December’s “Cold Moon” and a supermoon—the last full moon of 2025 and the last supermoon of the year. Astronomical services and observatories agree that the Moon reaches full phase at about 23:14 UTC on December 4,