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This weekend the night sky will showcase a blue micromoon – a rare alignment of a second full moon in a calendar month and a moon at its most distant point from Earth.Understanding the Dual Phenomenon: Blue Moon Meets MicromoonA "monthly blue moon" occurs when a second full moon appears in the same calendar month, as explained by Dr Greg Brown of the Royal Observatory Greenwich. A micromoon happens when the full moon coincides with the moon’s apogee, making it appear roughly 6% smaller than a typical full moon and about 14% smaller than a supermoon.Numbers Behind the Rarity: Frequency and Size DifferencesBlue moons: roughly every 2‑3 years.Micromoons: 2‑3 times per year.Combined blue micromoon: about once every 20‑30 years.Size reduction: ~6% smaller than average full moon, ~14% smaller than a supermoon.Why Stargazers Should Take Note: Visibility and Cultural ContextThe full moon peaks on 31 May at 9.45am BST (4.45am ET, 6.45pm AEST). For observers in the UK the moon will have set, but it remains visible throughout the night on Saturday and Sunday, appearing lower in the northern hemisphere sky and higher in the southern hemisphere. The event also revives the “once in a blue moon” expression, though the phrase likely stems from the rarer blue‑tinged moon caused by atmospheric particles.Looking Ahead: When the Next Blue Micromoon Might AppearAccording to Brown, the next UK blue micromoon is projected for 2066, while parts of the US may see one as early as 2053. Until then, enthusiasts can enjoy this once‑in‑a‑few‑decades spectacle.