Thursday’s full Cold Moon will be the last supermoon of 2025. It will officially reach full illumination on Thursday, 4 December 2025. The moon will be closest to Earth, appearing larger and brighter than usual. This event offers a rare opportunity for skywatchers across Australia and the world to witness the phenomenon under optimal conditions.
What is the Cold Supermoon?
The Cold Moon is the traditional name for the December full moon. This name signifies the onset of winter’s chill. The supermoon aspect means the moon will be near its perigee – the closest point to Earth in its orbit. On 4 December, the moon will be approximately 357,218 km away, about 21,254 km closer than its average distance. This proximity causes it to appear roughly 10% larger and brighter than a regular full moon.
Size comparison between the supermoon and the normal moon
Viewing Time and Location
The Cold Moon will fully illuminate at 6:14 pm Australian Eastern Daylight Time (AEDT) on Thursday. The best viewing time in Australia will be shortly after sunset on Friday, 5 December, when the moon rises in the east. At this time, the moon will appear particularly striking as it climbs above the horizon.
To see the Cold Supermoon at its peak, observers should find an open area with a clear view of the eastern horizon. Ideal locations include coastal areas facing east, hilltops, or open fields free of tall structures and trees that may obstruct the view. An elevated vantage point will give a better line of sight and enhance the experience.
Why the Cold Moon Appears Larger
The supermoon effect stems from the moon’s elliptical orbit. When the moon is near perigee and fully illuminated, it looks bigger and brighter to the naked eye. Additionally, the moon’s high arc across the night sky in December increases its visual impact. This full moon will be the second-closest of the year, making it an extraordinary sight.
Observers will notice the moon’s size, especially during the moonrise phase. The moon will rise about 25 minutes after sunset. This timing means the sky will be dark enough to appreciate the moon’s brightness while still showing the deep colours of twilight.
Why the cold moon appears larger
Viewing Tips and Equipment
Skywatchers are encouraged to dress warmly due to December’s cooler evenings. Bringing a blanket or chair will make the viewing more comfortable. Using binoculars or a small telescope can reveal details of the moon’s surface, enhancing the experience.
Photography enthusiasts can capture the moon’s impressive size at moonrise with a zoom lens. The event offers excellent opportunities for night-time photography due to the moon’s proximity and brightness.
Also Read: ChatGPT Restored After Global Disruptions as OpenAI Intensifies Work on Reliability
Importance of the Cold Supermoon in 2025
This December’s Cold Moon marks the last supermoon event of 2025. It provides a chance to observe the celestial mechanics of the moon’s orbit closely. The timing during the early evening makes it accessible for most viewers.
Astronomers and casual observers alike value supermoons for their spectacular size and brightness. The December Cold Moon will also offer a stunning view due to its high elevation in the sky, contrasting with the typically lower full moons of other months.
The cold moon acts as a reminder of the winter season ahead while offering a unique natural spectacle. Observing this event connects people with celestial rhythms and the Earth’s seasonal cycles.
