Supermoon 2024

There's another supermoon on the way, and it's going to be bigger and brighter than it has been for almost 70 years.

Following October's supermoon, this next one is predicted to appear on November 14, when the Moon will be the closest it has been to Earth since 1948.

Experts say it will appear up to 14% bigger and 30% brighter than an average full moon, and as it's not scheduled to happen again until 2024, it's a moment stargazers won't want to miss.

What causes an "extra-super moon"?

According to NASA, the science behind this phenomenon starts with the egg-shaped orbit of the moon.

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One part of the orbit known as the perigee, is about 30,000 miles closer to earth than the furthest part. When Earth, Sun and Moon line up as the Moon orbits the Earth (known as a syzygy), with the perigee side of the Moon facing us, we get what's called a perigee-syzygy. This effect causes the Moon to appear bigger and brighter than usual, resulting in a supermoon.

Although they aren't uncommon, with another supermoon due to appear in December, NASA argues November's event should be called "extra-super moon."

"On October 16 and December 14, the moon becomes full on the same day as perigee," NASA explains. "On November 14, it becomes full within about two hours of perigee—arguably making it an extra-super moon."

How can we see it?

NASA highlights that clouds or light pollution can sometimes mask the brightness of supermoons, so dark areas away from bright street lamps make ideal viewing spots.

And if you want to see the full moon at its best, it's expected to reach its peak at 1.52pm GMT on November 14th, so we should be able to see it later that night.

© Fernando Astasio Avila/ Shutterstock

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When a full Moon occurs at the closest point to Earth during its orbit, it appears larger and brighter, becoming what is commonly known as a 'supermoon'.

A supermoon is widely recorded as being much larger and far brighter than the Moon on any other night - and there's an easy explanation for it.

Museum planetary science researcher Prof Sara Russell shares what a supermoon is and what makes it shine so brightly.

The supermoon cycle

Supermoons are not unusual. They occur as a regular part of the Moon's orbit of Earth.

Sara explains, 'There is no formal scientific definition of a supermoon, but it occurs when there is a full Moon and the Moon is also closest to the Earth.'

'It is very rare that an orbiting body follows an exactly circular path. The Moon has a slight "eccentricity", meaning it travels in an elliptical path around the Earth - so it is sometimes nearer and sometimes further away.'

Throughout its orbit, the Moon varies between about 360,000 and 400,000 kilometres away from our planet.

Perigee is the point at which the Moon is closest to the Earth. When the Moon is at this point, it appears around 14% bigger than a full Moon at the furthest point away, at apogee - when the Moon is sometimes called a 'micromoon'.

'It's not that much, actually, and it's doubtful that it makes a huge difference to how it looks, but it gets people looking up at the Moon and thinking about it,' says Sara.

Why does the Moon look so big?

As a supermoon rises and sets on the horizon, it will appear even larger. This is because of the well-known 'Moon illusion'.

A well-known illusion causes the Moon to appear bigger on the horizon than in the middle of the night sky © Steve Heap/ Shutterstock.com

'The Moon, of course, does not vary in size according to where it appears in the sky,' says Sara.

'It may be that when it is near the horizon there are objects, like trees and buildings, that it can be compared in size to, whereas in the middle of the sky there are no points of comparison, which makes it seem smaller.'

Extra bright

Supermoons cast about 30% more light on the planet than when the Moon is at its dimmest. This is because as it is closer, more of the Sun's rays that reflect off the lunar surface make it to Earth.

Sometimes full Moons coincide with the Moon passing especially close to Earth. When this happens, it results in a particularly spectacular supermoon. The one on 14 November 2016 was the closest since 26 January 1948. It won't be beaten until 25 November 2034.

The closest supermoon of this century will occur on 6 December 2052.

Sara adds, 'The Moon is actually, very slowly, moving away from Earth, so our supermoon today was just a typical Moon a billion years ago.'

How often does a supermoon occur?

A full Moon occurs once in each lunar cycle, which lasts 29.5 days. But not every full Moon is a supermoon - there are only usually three or four supermoons in a year. Between 2020 and 2025, there will be four each year.

Sara explains, 'During a supermoon, the Moon is at a stage where it is closest to Earth. This will typically last for two to five full Moons, so that's why there are multiple supermoons in a row. After that, the Moon goes into the more distant part of its orbit.'

Do supermoons cause natural disasters?

The ocean's tides are caused by the gravitational forces of both the Sun and the Moon. Some theories suggest that supermoons can cause dramatic natural events, such as massive earthquakes and volcanic eruptions.

Sara disagrees: 'There seems to be no basis for thinking this is the case. Natural disasters are no more common when there is a supermoon than when there is not.

'There will be an effect on tides, but this is very tiny, perhaps only affecting them by a few centimetres at the most.'

When is the next supermoon?

Supermoons in 2022 will occur on:

• 16 May
• 14 June
• 13 July
• 12 August

These are predicted by astrophysicist Fred Espenak. See more supermoon dates on his Astropixels website.

Special supermoons

On rare occasions, a lunar eclipse occurs on the same night as a supermoon. Because the Moon looks red, it is known as a 'super blood Moon'. This was the case on 21 January 2019.

Very little light reaches the Moon during a lunar eclipse. Instead of being blocked out completely, it appears red in colour. Image courtesy of Bautsch via Wikimedia Commons.

Even more rarely, this also coincides with a blue Moon, the name given to the second full Moon in a calendar Month. This is what happened on the night of 31 January 2018 - a super blue blood Moon.

Sara explains what happens during an eclipse of the Moon:

'During a lunar eclipse, the Sun, Earth and Moon are in perfect alignment. The Earth is in the middle and blocks out most of the sunlight, but a little light will reach the Moon from around the edges of the Earth.

'As this light passes through Earth's atmosphere it will tend to refract, or bend, slightly. Blue light bends more than red light, so the blue light is more scattered. More red light tends to make it to the Moon and is then reflected off the lunar surface to come to Earth. So to us, the Moon appears red.

'Lunar eclipses can look amazing, and when it is a supermoon it should be quite a spectacle.'

The next supermoon lunar eclipse will take place on 18 September 2024. It will be a partial eclipse, so only part of the Moon will pass into Earth's shadow and appear red.

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