Astronomy

Blue moon

1839days

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    About this moment

    There are 1,839 days until Blue moon, on Tuesday, 30 September 2031.

    The second full Moon of September 2031 (UTC), at 18:58 UTC on 30 September 2031: a calendar "blue moon". Two full Moons in one month happen roughly every two and a half years; the Moon does not actually change colour. Time computed with astronomy-engine.

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    Date source

    Computed astronomy

    Last verified Sep 10, 2026

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