As December settles in and winter begins to take hold, the night sky gears up for one of its most anticipated sights of the year—the Cold Supermoon. Falling on December 4, this striking lunar event is not only December’s traditional full moon but also the final supermoon of 2025, rounding off a trio that began in October and continued through November.

The term supermoon refers to a full moon that occurs when the Moon reaches or comes very close to perigee, the closest point to Earth in its elliptical orbit. This reduced distance makes the Moon appear slightly larger and significantly brighter—up to 30 pct more luminous than a typical full moon. Although the difference may not always be dramatic to the naked eye, the enhanced glow often creates a noticeable visual impact, especially under clear winter skies.