The moon will occupy a touch less of the sky, its light spread across a fractionally larger area.
Each month, the sky offers a quiet reminder that we live in motion — orbiting, tilting, cycling through light and shadow. This Friday at 18:23, May's Flower Moon reaches fullness near its farthest point from Earth, rendering it a micromoon: marginally smaller, slightly dimmer, yet no less ancient in its meaning. Named for the blooms that define the season, it rises into a spring evening that may or may not be clear, and for those who miss it, a rare Blue Moon waits at the month's end — a second chance written into the mathematics of time itself.
- The Flower Moon peaks Friday at 18:23, but its position near apogee — 406,000km away — means it will appear subtly smaller and dimmer than the full moons most people carry in memory.
- The difference between a micromoon and a supermoon spans roughly 43,000km, a gap invisible to the casual eye but meaningful enough for photographers and devoted sky-watchers to notice.
- Approaching low-pressure systems from the west are threatening to pull a curtain of cloud across much of the UK on Friday night, turning a celestial event into a game of patience and weather-watching.
- Wales, the Midlands, and parts of southern England hold the best odds for clearing skies, while the rest of the country may catch only fleeting glimpses through breaks in the cloud.
- Anyone shut out by Friday's weather has a rare consolation: a Blue Moon rises on May 31st, the result of thirteen full moons fitting into a single calendar year — an event uncommon enough to have given language one of its most enduring phrases.
Friday night brings May's Flower Moon to its peak at 18:23 — a moment that has carried the same name for centuries, rooted simply in the fact that May is when flowers truly arrive and winter finally releases its hold. But this year's version carries a quiet distinction: it is a micromoon.
The moon's orbit is not a circle but an ellipse, meaning its distance from Earth shifts constantly. At its closest, it sits around 356,000 kilometres away; at its farthest — apogee — it retreats to roughly 406,000 kilometres. This Friday's Flower Moon falls near that far point, making it marginally smaller and slightly dimmer than the full moons most people picture. The difference is nearly invisible to the naked eye, though a camera will catch it. For most observers, the feeling will be less a measurement and more a vague sense that something is subtly off.
Weather may prove a greater obstacle than orbital geometry. A high-pressure system that has kept skies clear is drifting toward continental Europe, and lower pressure is advancing from the west, bringing cloud and possible rain. The forecast is uneven: parts of Wales, the Midlands, and southern England may see clearing by evening, but much of the country could find the moon hidden. Even a brief appearance through breaking cloud carries its own drama.
Those who miss Friday have an unusual second chance. On May 31st, a Blue Moon will rise — a second full moon within a single calendar month, possible because the lunar cycle runs about 29.5 days and occasionally delivers thirteen full moons in a year instead of twelve. It is rare enough to have shaped a phrase: "once in a blue moon." The sky, it turns out, is patient with those who are willing to wait.
Friday night, if the clouds cooperate, the sky will offer something worth stepping outside for. May's full moon—the Flower Moon, as it has been called for centuries—reaches its peak illumination at 18:23, rising into a spring evening when the world is already thick with bloom. The name itself is straightforward: May is when flowers truly arrive, when winter's grip has fully released and gardens begin their show. But this particular Flower Moon carries a distinction that will make it subtly different from the lunar displays most people remember.
It is what astronomers call a micromoon, and the reason has to do with geometry. The moon does not orbit Earth in a perfect circle. Its path is elliptical, which means the distance between us and our satellite shifts month to month. At its closest approach—a point called perigee—the moon sits roughly 356,000 kilometers away. At its farthest, known as apogee, it recedes to about 406,000 kilometers. The difference amounts to approximately 43,000 kilometers, a gap that sounds enormous until you try to see it with your own eyes. To the naked observer, a micromoon appears marginally smaller and slightly dimmer than a full moon at perigee. Photographs will show the difference more clearly than any glance upward ever could.
This year, when the Flower Moon reaches fullness on Friday, it will be near apogee—at that maximum distance from Earth. The visual effect is subtle but real: the moon will occupy a touch less of the sky, its light spread across a fractionally larger area. For most people, the change will be imperceptible. For photographers and those accustomed to watching the lunar cycle, it will be noticeable enough to register as something slightly off, something diminished.
Weather, however, may prove a more significant obstacle than orbital mechanics. An area of high pressure that has kept skies clear and days sunny is moving away toward continental Europe. In its place, lower pressure systems are advancing from the west, bringing clouds and the possibility of rain. Friday night's forecast is mixed: Wales, the Midlands, and southern England may see clearing skies by evening, but much of the country could find the Flower Moon obscured. Even a glimpse through breaks in the cloud cover, though, will carry its own drama—the moon emerging briefly from darkness, then disappearing again.
For those who miss Friday's opportunity, the calendar offers a consolation. Later in May, on the 31st, a second full moon will rise. This is rare enough to have earned its own name: a Blue Moon. The phenomenon occurs because the lunar cycle runs approximately 29.5 days, which means roughly every two to three years, thirteen full moons squeeze into a single calendar year instead of the usual twelve. In 2026, that extra moon falls at the very end of May. The phrase "once in a blue moon" derives from this infrequency—something that happens so rarely it seems almost mythical. If Friday's clouds prove too thick, there will be one more chance before May closes, though waiting another month for a celestial event requires a patience most stargazers would rather not test.
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The difference between apogee and perigee is approximately 43,000 kilometers—sounds huge, but to the naked eye the change is barely noticeable except in photographs.— Darren Bett, BBC Weather
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Why does the moon look smaller sometimes? Is it actually shrinking?
No, it's not shrinking. The moon's orbit is slightly oval rather than circular, so some months it's closer to us, some months farther. When it's at its farthest point—about 406,000 kilometers away—we call it a micromoon. The difference is real but small enough that most people won't notice it just by looking up.
So if I can barely see the difference, why does it matter that this Friday's moon is a micromoon?
It matters more to photographers and people who track these things carefully. But there's also something worth knowing: it's a reminder that what we see in the sky isn't fixed. The moon's distance from us varies constantly. This particular Flower Moon happens to arrive when it's at one extreme of that variation.
The name Flower Moon—is that scientific or traditional?
Traditional. It comes from the fact that May is when flowers genuinely begin to bloom in earnest. Different cultures have different names for each month's full moon, and this one stuck because it describes what's actually happening on the ground when it rises.
What about the Blue Moon at the end of the month? Is that also a distance thing?
No, that's purely a calendar thing. The lunar cycle is about 29.5 days, so roughly every two or three years, you get thirteen full moons in a year instead of twelve. That extra one is the Blue Moon. It's not actually blue—the name comes from how rare it is. Hence "once in a blue moon."
If clouds block the view Friday, is the Blue Moon a real backup plan?
In theory, yes. But you're asking someone to wait until May 31st to see something they could have seen on the first. Most people won't wait. Still, it's there if they do.