Get ready stargazers, the final full moon of 2025 rises tonight! Here's what to expect when the "Cold Supermoon" looms large over the eastern horizon at sunset on Dec. 4.
The exact moment of December's full moon phase will take place at 8:13 p.m. EST (2313 UTC) on Dec. 4, at which time the lunar disk will appear fully illuminated opposite the sun in Earth's sky, shining brightly above the eastern horizon. The December full moon is sometimes known as the "Cold Moon" in reference to the plummeting temperatures that are common this time of year and also as the "Long Night Moon," to reflect the lengthening nights and shorter days as the northern hemisphere sinks deeper into the winter months.
