The last supermoon of 2025 is known as a Cold Moon. It will rise as Geminid meteor showers begin. There will be plenty more night sky action early in the New Year, too.
Look east on the night of December 4 and you will see the final supermoon of 2025.
Supermoons occur when a full moon coincides with the moon's closest approach to Earth, known as the moon's perigee. The moon then appears up to 10% larger and much brighter than usual.
On December 4, 2025, the moon will be around 17,000 miles (27,300 kilometers) closer to Earth. This supermoon is also known as a "cold" full moon because it marks the start of colder, darker months ahead.
A 'moon illusion' on the horizon
If skies are clear, the moon may appear larger than it usually does as it rises over the horizon. But to most people, the difference will be indiscernible.
However, when the moon does appear to be larger, it is due to what is known as a moon illusion — a strange phenomenon for
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