SCIENCE & NATURE

Why are there two full moons in May 2026?

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Two full moons occur in May 2026 because the lunar cycle is approximately 29.5 days, allowing two complete full moon phases to fit within the month.

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First Full Moon in May 2026May 1, 2026 (Flower Moon)
Second Full Moon in May 2026Around May 23, 2026
Lunar Cycle DurationApproximately 29.5 days
Full Moon DefinitionWhen the whole face of the Moon is illuminated and fully visible from Earth
Moon Orbit PeriodThe Moon takes roughly 29.5 days to circle Earth once through eight distinct phases

Why Two Full Moons Fit in May

The lunar cycle takes approximately 29.5 days to complete. Since May has 31 days, this timing allows for two full moon phases to occur within the calendar month. The first full moon is predicted for May 1, 2026, and the second occurs around May 23, 2026.

The Lunar Cycle Explained

The Moon takes roughly 29.5 days to orbit Earth once, going through eight distinct phases during this period. As the Moon moves in its orbit, the amount of sunlight hitting it changes, creating the shifting light patterns we observe as different lunar phases. Even though we always see the same side of the Moon, the changing illumination creates the full, half, and crescent shapes we recognize.

May 2026 Full Moon Events

The first full moon in May 2026 is called the Flower Moon or Full Flower Moon, representing peak brightness in the lunar orbit. The lunar calendar for May 2026 includes the Last Quarter on May 1st, the New Moon on May 9th, the First Quarter on May 16th, and the Full Moon around May 23rd. This rare occurrence of two full moons in one month is referred to as a double-moon May.

Sources

  1. Moon phase today: What the Moon will look like on April 30 (mashable.com)
  2. What does today’s moon tell us about the Waxing Gibbous phase of the lunar cycle? (primetimer.com)

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