The last full moon of 2025 is barely a week away in the astronomical calendar, which will be especially spectacular as it is also a supermoon -a phase in which the satellite is closer to the Earth and, consequently, looks bigger and brighter than usual-.
The phenomenon will occur during the evening of December 4 to 5, reaching its maximum splendor at 00:14h on December 5. This supermoon will put an end to a succession of two others in a row -which occurred on October 7 and November 5-, something unusual.
For those who especially enjoy observing the night sky, it is highly recommended not to miss this opportunity, since a full moon of these characteristics will not be seen again until 2042.
This exceptionality is explained by the major lunar standstill, a phenomenon that occurs every 18.6 years: at those moments the moon’s declination reaches a maximum point, modifying its trajectory and visibility, making it appear very high on the horizon of the northern hemisphere.
A full moon with its own name
As with other astronomical phenomena such as the Strawberry Moon or the Harvest Moon, this last full moon of 2025 also has a popular designation: Cold Moon or Long Nights Moon.
This nomenclature, which has weight especially in the Anglo-Saxon context, has its origin in that it occurs during one of the coldest months of the year, and when the nights are the longest.
What is the best way to see this cold supermoon?
To observe this last full moon of 2025 no special equipment is necessary, although the observation will be more detailed through tools such as telescopes.
To contemplate it in the best conditions, it is recommended to look for a place without light pollution.