A rare blue micromoon rose over the Temple of Poseidon at Cape Sounion, Greece, on Sunday, May 31 [1, 2].
The event is significant because it combined two distinct lunar phenomena. A "blue moon" occurs when there are two full moons in a single calendar month, while a "micromoon" occurs when the moon is near its apogee, the point in its orbit farthest from Earth [1, 2].
This specific lunar event marked the second full moon of May 2026 [1]. Because the moon was at its farthest point from Earth, it reached its smallest apparent size of the year [2]. The resulting illumination provided a rare backdrop for the ancient ruins at Cape Sounion, a site known for its dramatic coastal views and historical significance.
While the event was prominently captured over the Greek temple, the micromoon was also visible from other parts of the world, including New Delhi, India [2]. Astronomers said that the combination of a blue moon and a micromoon is an infrequent occurrence, as it requires the lunar cycle to align precisely with the calendar month and the orbital distance from Earth.
The sighting occurred as the region transitioned toward the end of spring [1]. Observers in both Greece and India witnessed the moon's diminished size compared to a typical full moon, which creates the opposite effect of a "supermoon" where the moon appears larger and brighter [2].
“The blue micromoon rose above and illuminated the Temple of Poseidon at Cape Sounion, Greece.”
This event demonstrates the intersection of orbital mechanics and calendar tracking. While a 'blue moon' is a naming convention based on the Gregorian calendar and a 'micromoon' is a physical result of the moon's elliptical orbit, their simultaneous occurrence creates a rare visual event for skywatchers and historians alike.
