Those who look up at the sky this evening will be lucky enough to enjoy a stunning sight. Tonight will be the first supermoon of the year and at the same time the biggest and brightest for 2025. This happens because the Moon is at the closest point in its orbit to Earth.
What is a supermoon?
The Moon's orbit around the Earth is not circular, but elliptical, meaning the distance between them changes throughout the year. When the full Moon coincides with the closest point in its orbit, called perigee, or when it is up to 90% close to that point, then we have what is called a "supermoon."
This term was first used in 1979 by astrologer Richard Nolle to describe full moons that appear larger and brighter to the naked eye due to their proximity to Earth.
Under these conditions, the Moon can appear up to 14% larger and 30% brighter than usual, an effect that is visible to the naked eye, especially to its east and west.
Astronomers don't fully agree on a single definition of a supermoon. Some consider it any full moon that is within 225,000 miles (360,000 kilometers) of the center of the Earth. Under this definition, for example, the Harvest Moon that will occur in October would not be considered a supermoon.
However, in any case, today's supermoon is a perfect opportunity to pause for a moment, look up at the sky, and take a close look at one of the most beautiful natural wonders of the year.
