"The term supermoon refers to a full moon that occurs when our satellite is at perigee, the point at which its orbit brings it closest to our planet. (The moon's orbit is elliptical, and its distance from Earth varies between about 407,000 km at apogee, the point of maximum distance, and about 380,000 at perigee.)"
"Although most of us won't notice any difference in size compared to a normal full moon (it appears up to 8 percent larger to us), its brightness could exceed that of an ordinary full Moon by 16 percent. This time, moreover, it will be 100 percent illuminated just 12 hours after its perigee."
"In addition to its name, which refers to the cold temperatures of this period, December's full moon will be the last of 12 full moons in 2025 and the highest of the year. With the winter solstice approaching on December 21, the sun is at its lowest point in the sky, so the full moon is at its highest point. In other words, this means that the super cold moon will be particularly high in the sky. As points out, however, it is not the closest full Moon to the December 21 solstice. While it occurs 17 days before, the first full moon of 2026 will occer on January 3-just 12 days ater teh solstice. That will be the fourth and last consecutive supermoon."
A cold supermoon will occur on December 4 and will be the last full moon of 2025. The Moon will be near perigee, roughly 357,000 km away, making it one of the closest, largest, and brightest full moons of the year. The Moon can appear up to about 8 percent larger and its brightness may exceed a normal full Moon by around 16 percent, achieving full illumination roughly 12 hours after perigee. December's Cold Moon will sit especially high in the sky as the winter solstice approaches, and a January 3, 2026 full moon will follow as another supermoon.
Read at WIRED
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