Once-in-a-century astronomical phenomenon: why are there three supermoons in a row?

From October to December 2025, astronomy lovers will be able to admire 3 consecutive supermoons. The first supermoon will take place on October 7.

On October 7, the first supermoon of 2025 (also known as the super harvest moon or super harvest moon) will light up the sky. It will be the biggest and brightest full moon of the year and the first supermoon since November 2024. Photo: Lorenzo Di Cola/NurPhoto via Getty Images.

After the first supermoon of 2025, the next two supermoons will take place on November 5 and December 4, respectively. Although there are an average of 3-4 supermoons each year, it is very rare to see all of them concentrated in one season like this year. Photo: Tayfun Coskun/Anadolu via Getty Images.

The event of three consecutive supermoons will repeat in the winter of 2028 on January 12, February 10 and March 11. Photo: moonandgarden.com.

The term "supermoon" was first coined by astrologer Richard Nolle in 1979 to describe a full moon that is significantly larger and brighter due to the Moon's position at perigee. Typically, a supermoon will appear 14% larger and 30% brighter than other full moons. Photo: Getty.

The Moon's orbit around Earth is not circular, but elliptical. This means the distance between the Moon and Earth varies greatly throughout the year. Photo: Matthias Hangst/Getty.

During a full moon, the moon is at its closest point to Earth, called perigee. According to NASA, in early October this year, the moon was 222,000 miles (361,457 km) from Earth, 10% closer than the usual distance of 240,000 miles (384,400 km). Photo: Alan Dyer/VW Pics/Universal Images Group via Getty Images.

A supermoon requires two main factors to happen. The moon needs to be at its closest point, or perigee, to Earth in its 27-day orbit. The moon also needs to be in its full phase, which occurs every 29.5 days when the sun completely illuminates the moon. Photo: Getty.

Supermoons only occur a few times a year because the Moon's orbit changes direction as the Earth revolves around the Sun. That's why it's rare for skywatchers to see a supermoon for three consecutive months like this year. Photo: scopetrader.com.

Readers are invited to watch the video : Universe map with more than 900,000 stars, galaxies and black holes. Source: THĐT1.

Source: https://khoahocdoisong.vn/hien-tuong-thien-van-tram-nam-moi-co-mot-vi-sao-3-sieu-trang-lai-noi-nhau-post2149058503.html