This rare lunar combo offers a quiet moment of skywatching, useful context for a friend who loves celestial events.
Rare Blue Micromoon This Weekend Story flow and key facts
This weekend brings a rare alignment of two lunar phenomena: a blue moon and a micromoon. A blue moon, in the most common definition, refers to the second full moon in a single calendar month — an event that occurs roughly every two to three years. A micromoon happens when the full moon coincides with the moon’s farthest point from Earth in its elliptical orbit, making it appear about 14% smaller than a supermoon. When both occur together, it’s known as a blue micromoon.
The exact full moon moment is on May 31, 2026, at 9:45am BST, but the moon will appear full on both the night before and after, giving skywatchers in the UK and other regions a chance to view it on Saturday or Sunday night. Observers in the northern hemisphere will see the moon relatively low in the sky, while those in the southern hemisphere will see it high overhead.
Despite the name, the moon will not appear blue. The term 'blue moon' is unrelated to color. However, under rare atmospheric conditions — such as after major forest fires or volcanic eruptions — dust particles can scatter light and give the moon a bluish tint. The next blue micromoon visible from the UK isn’t expected until 2066, though some regions like the US may see one earlier, in 2053.
Facts
- A blue micromoon — the combination of a blue moon and micromoon — occurs about once every couple of decades.
- This blue moon is defined as the second full moon in May 2026, occurring on May 31 at 9:45am BST.
- A micromoon appears about 14% smaller than a supermoon because it happens when the moon is near its farthest point from Earth.
- The moon will not actually appear blue; the term refers to timing, not color.
- The next blue micromoon visible from the UK is expected in 2066, though one may be visible in the US in 2053.
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