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Checked out Vivid, and keen to get a more natural fix of luminous fun? You’re in luck – the moon is about to pull off a quiet little magic trick in the sky above Sydney. On Sunday, May 31, 2026, NSW’s night sky will serve up a rare double feature: a Blue Moon that also happens to be a micromoon. It’s a celestial event that sounds more dramatic than it looks – but it’s a powerful and rare sighting, so it’s worth wrapping up and heading outside after sunset this Sunday.
What is a blue moon?
Despite the poetic name, a Blue Moon has nothing to do with colour. It’s all about timing. In casual terms, a Blue Moon is the second full moon to occur within a single calendar month – which is exactly what’s happening on May 31, 2026. It’s essentially a bonus round of moonlight. Astronomers, however, play by slightly different rules. In the more technical definition, a Blue Moon is the third full moon in a season that unusually contains four full moons instead of the standard three. Either way, the takeaway is the same: it’s an “extra” full moon, not a cobalt-tinted one.
What is a blue micromoon?
Now for the twist. This particular Blue Moon is also a micromoon – which sounds tiny and, technically, is. The moon doesn’t orbit Earth in a neat circle; it moves in an elongated oval. That means sometimes it swings closer to us (perigee), and sometimes it drifts further away (apogee). A micromoon occurs when a full moon lines up with that furthest point. On this night, the moon reaches fullness just before it hits apogee, sitting roughly 406,000 kilometres away. The result? It can appear up to 14 per cent smaller than a supermoon and about six per cent smaller than your average full moon. Before you start squinting: no, it won’t look obviously mini. In fact, thanks to a visual quirk called the moon illusion, it might actually seem larger when it’s low on the horizon. Astronomy loves a contradiction.
When is the May 2026 full moon?
Mark your calendar for Sunday, May 31, 2026. The moon will reach peak fullness at 6.45pm AEST, just as the evening sky is settling into that dusky blue sweet spot. Conveniently, this means you won’t need to stay up until all hours to catch it at its brightest.
How can you see the May 2026 blue micromoon in Sydney?
Sydney’s recent moody skies aside, this is a relatively easy one to spot if the clouds behave.
The moon will rise just after sunset in the southeast, before arcing low across the southern sky and setting in the southwest before dawn. Around midnight, it’ll be sitting squarely in the south. Your best bet is to find a spot with a clear view of the southern horizon – beaches, open parklands or anywhere without too many buildings blocking your line of sight. The lower the moon sits, the more atmospheric the show: it may glow orange or reddish, thanks to light scattering through thicker layers of Earth’s atmosphere.
Adding to the drama, a bright red star – Antares – will hover nearby, making the whole scene feel a little more cinematic than your average lunar outing. And while you won’t notice the moon shrinking before your eyes, that’s not really the point. This is one of those slow-burn sky events: subtle, a little nerdy, and undeniably beautiful if you give it a moment.
When it comes to fully appreciating the full moon, the darker the area you're in, the better. You can find our top spots in this handy guide to the best stargazing spots near Sydney.
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