A rare Blue Moon and micromoon will be visible in the night sky during the early hours of Sunday, May 31, 2026 [1].
This event is significant because it combines two distinct lunar phenomena. A Blue Moon occurs when there are two full moons in a single calendar month [1]. Simultaneously, the moon will be at its apogee, the point in its orbit farthest from Earth, which creates a micromoon that appears smaller than a typical full moon [3].
The alignment will be visible globally, though observers in Central California, U.S., are expected to have particularly good viewing conditions [3]. Because the moon is at its farthest point from Earth during this phase, the visual size of the lunar disk is reduced compared to a supermoon.
Astronomers said that this specific combination of a calendar Blue Moon and a micromoon is an infrequent occurrence [2]. The event will peak in the early hours of May 31 [2]. Observers do not need special equipment to view the moon, as it will be visible to the naked eye across the night sky [1].
This marks the second full moon of May 2026 [1]. While the term "Blue Moon" suggests a change in color, the moon will maintain its usual appearance; the name refers strictly to the timing of the lunar cycle rather than a visual hue [2].
“A rare astronomical alignment will bring a second full moon to May 2026.”
The occurrence of a micromoon during a Blue Moon event highlights the eccentricity of the lunar orbit. Because the moon's path is elliptical rather than circular, its distance from Earth fluctuates, affecting its perceived size. This event provides a natural contrast to the more widely publicized supermoons, illustrating the extremes of the moon's orbital proximity.
