A rare blue moon and micromoon will occur on May 31, 2024 [1], appearing as the second full moon in a single calendar month.
This event is significant because it combines two distinct astronomical phenomena. While blue moons are relatively uncommon, the addition of a micromoon phase alters the visual appearance of the lunar surface for observers worldwide.
A blue moon is the second of two full moons in the same month, a coincidence that only takes place about every two and a half years, Smithsonian Magazine said [2]. This specific occurrence happens when the lunar cycle aligns such that two full moons fall within the same calendar month [1].
Simultaneously, the Moon will be near its apogee, the point in its orbit farthest from Earth. This positioning creates a micromoon, which makes the lunar disk appear slightly smaller and dimmer than a typical full moon [1, 2].
The Moon will be located in the constellation Sagittarius during the event [3, 4]. Observers should look for the blue moon low in the southeastern sky after sunset, HotHardware said [5].
While the event is visible across most of the world, the specific viewing angle varies by region [3]. The combination of the blue moon and micromoon status makes this particular date a point of interest for astronomers and casual observers alike.
“A blue moon is the second of two full moons in the same month”
This event demonstrates the intersection of the calendar month and the elliptical nature of the Moon's orbit. Because the lunar cycle does not align perfectly with the 30- or 31-day Gregorian month, 'blue moons' serve as a chronological correction. The micromoon aspect highlights the variance in the Moon's distance from Earth, which affects the apparent size and luminosity of the satellite.
