
A supermoon occurs when a full Moon coincides with its closest approach to Earth, or perigee, making it appear slightly larger and brighter than a typical full Moon.
December’s Cold Moon is the third consecutive supermoon of the year and the last of 2025.
It will reach peak illumination of 99.8% at 4:15 am PST on December 5, while in Pakistan, the Moon—99.2% illuminated—will rise at 4:58 pm PST on December 4, allowing skywatchers to enjoy the spectacle throughout the night.
Although slightly smaller than the November supermoon, the December full Moon will still appear 7.9% larger and 15% brighter than a regular full Moon, as the Earth–Moon distance on December 4–5 will be 357,218 km compared to 356,978 km in November.
Supermoons typically occur three to four times a year, depending on how closely the full Moon aligns with perigee.
While the difference may be subtle to the naked eye, exceptionally close alignments producing the brightest supermoons are rare and of scientific interest.
Suparco encourages the public, astronomy enthusiasts, students, and families to observe this natural spectacle.
No special equipment is required; the supermoon will be easily visible to the naked eye, provided the skies remain clear.
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