Prepare to be amazed! The final Supermoon spectacle of 2025 is about to grace our skies, and you absolutely don't want to miss it. Get ready for a celestial show that promises to be both breathtaking and awe-inspiring.
Mark your calendars! The peak illumination of this dazzling Supermoon will occur at 6:15 p.m. EST on December 4th, according to the venerable Old Farmer's Almanac. This isn't just any full moon; it's the grand finale, the third and final Supermoon of the entire year! At its closest point, this 'Cold Moon' will be approximately 221,965 miles from Earth. But here's the best part: it will appear full not just on Wednesday night, but also on Friday night, giving you ample opportunities to witness its splendor. Weather permitting, of course. Imagine capturing stunning photos or simply basking in the beauty of the autumnal evening sky, illuminated by this radiant lunar display.
Now, let's talk about why this moon seems so extraordinarily large. It's not just your imagination! There's an optical illusion at play, known as the 'moon illusion.' When a full moon rises behind distant objects on the horizon – trees, buildings, mountains – it appears significantly larger than when it's high in the sky. And a Supermoon? Well, that effect is amplified, making it seem truly gigantic.
So, what exactly is a Supermoon? Simply put, it's when a full moon coincides with the moon's closest approach to Earth in its orbit. Remember, the moon's orbit isn't a perfect circle; it's slightly elliptical. And this is the part most people miss... because of this elliptical orbit, the distance between the Earth and moon varies throughout the month. When a full moon occurs at or near the point of closest approach (perigee), we get a Supermoon! This proximity makes the moon appear noticeably bigger and brighter than usual. In fact, Supermoons can appear up to 14% larger and a whopping 30% brighter than the smallest, faintest moon of the year.
But here's where it gets controversial... What constitutes a 'Supermoon' isn't universally agreed upon. As NASA points out, "Different publications use slightly different thresholds for deciding when a full moon is close enough to the Earth to qualify as a supermoon." This lack of a strict definition can lead to some debate within the astronomy community and even among casual stargazers.
Ever wondered why December's full moon is called the 'Cold Moon'? The name has Native American origins, specifically from the Mohawk tribe. They bestowed this title upon it to reflect the characteristically frigid temperatures that prevail during this time of year. The Mohicans also referred to it as the "long night moon," a fitting description given the long, dark nights of December.
Full moons typically occur roughly every 29 days. This is known as the moon's synodic period. However, because most months have 30 or 31 days, it's occasionally possible to have two full moons in a single month – a phenomenon often referred to as a 'Blue Moon.'
If you happen to miss this final Supermoon of 2025, don't despair! You'll have three more chances to witness Supermoons in the following year. So keep looking up!
Contributing: Doyle Rice
Source: NASA, TheSkyLive.com, MoonPhaseToday.org, EarthSky.org and USA TODAY research
Now, for some food for thought: Do you think the current definition (or lack thereof) of a Supermoon is accurate enough? Does it truly capture the essence of this celestial event, or should we strive for a more precise, universally accepted definition? Share your thoughts and opinions in the comments below! Do you think these celestial events also influence our mood and behaviours?
