SCIENCE + TECHNOLOGY

Prepare for a stunning double-supermoon display in August

Aug 1, 2023, 5:00 AM | Updated: Jan 19, 2024, 10:41 am

The sturgeon supermoon rises behind the Basilica of San Bernardino in L'Aquila in Italy's Abruzzo r...

The sturgeon supermoon rises behind the Basilica of San Bernardino in L'Aquila in Italy's Abruzzo region, on August 12, 2022. Photo credit: Lorenzo Di Cola/NurPhoto/Getty Images

(CNN) — Big, bright lunar displays will bookend August as the moon nears its closest point to Earth. When the moon reaches this position in its orbit while also appearing full, the result is a supermoon — and there will be two this month.

The first of the supermoons will peak at 2:32 p.m. ET on Tuesday, which means lunar gazers in Europe, the United Kingdom, Africa and the Middle East can catch the orb glowing at its fullest in the night sky at a distance of about 222,158 miles (357,530 kilometers) from Earth, according to calculations from retired NASA astronomer Fred Espenak. For viewers in the United States, rest assured the moon will look round during the evening of August 1. Supermoons generally look brighter and bigger than other full moons because of their proximity, though it’s not always perceptible to the naked eye.

This week’s full moon is also called the “sturgeon moon” because it occurs around the time of year that, historically, indigenous populations found the large freshwater fish were easily caught in the Great Lakes, according to The Old Farmer’s Almanac. Stateside, you can best catch a glimpse of the sturgeon supermoon after sunset Tuesday, looking toward the southeast.

Then, on August 30, a full moon will appear at the closest point to our planet this year — about 222,043 miles (357,344 kilometers) away — making it an elusive super blue moon.

A blue moon, in common parlance, refers to a second full moon that occurs within the same calendar month, which typically happens only once every two and a half years. The most recent blue moon, for example, occurred in October 2020.

The August 30 super blue moon will reach its peak at 9:36 p.m. ET, according to the almanac. The celestial orb will also be visible the night of August 31, local weather conditions allowing.

But take note: It won’t appear blue, despite the name. The term actually originates from a 16th century expression, in which a blue moon referred to something that never — and later rarely — happened, according to Encyclopaedia Britannica.

What is a full moon, supermoon and blue moon?

A full moon occurs when the near side of the moon is fully illuminated by the sun in the night sky, which typically happens once a month.

Supermoons are more uncommon.

These lunar displays occur because the moon does not travel in a perfect circle around Earth. Rather, the moon’s path is shaped like an oval, bringing the moon closer to the Earth at certain points on its elliptical journey. The exact distance between Earth and the moon can vary by about 26,222 miles (42,200 kilometers), according to NASA.

Supermoons occur when the moon is near or at its closest point to Earth (or, in scientific terms, its perigee) while also appearing full.

Scientists call this a “perigean full moon,” and it can be up to 30% brighter and appear about 14% larger than full moons that occur at the farthest point from Earth, according to the United Kingdom’s National Space Centre.

Some argue that the term supermoon is overused because it can refer to full moons that don’t occur at the absolute nearest point to Earth — and they don’t always appear drastically different to the human eye than the average full moon.

As NASA explains, while supermoon isn’t an official astronomical term, “it’s used to describe a full Moon that comes within at least 90 percent of perigee.” And these lunar events aren’t uncommon: Supermoons typically occur three or four times per year.

In fact, the instances where the moon looks largest in the sky are typically when it appears close to the horizon, creating an optical illusion, notes researcher Adam Block, an operations specialist at the University of Arizona’s Steward Observatory in Tucson. And that phenomenon has nothing to do with whether the moon is in supermoon territory.

“If you turn around in the opposite direction, and if you’re flexible, you can bend over and look between your legs at the moon upside down and the illusion completely disappears,” Block explained.

Supermoons aren’t particularly rare or visually distinctive, but they do impact the Earth. The moon’s physical closeness can cause higher tides in the Earth’s oceans, NASA notes.

Blue moons, however, are rarer. While the term originally referred to an extra full moon occurring within the same tropical year — the period between two equinoxes— it now commonly refers to two full moons appearing within the same calendar month.

Not all blue moons are supermoons, which makes the August 30 full moon even more exceptional. The next time two supermoons will occur in the same month will be January 2037, according to Espenak’s data.

Sometimes, several lunar phenomenon line up on the same night to create a truly extraordinary sky-watching experience, such as on January 31, 2018, when the last full moon of the month was not only a blue moon and a supermoon — it was also a blood moon, or a total lunar eclipse. Those events occur when Earth’s shadow gives the full moon a reddish tint.

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Prepare for a stunning double-supermoon display in August