Skywatchers in Greece observed a rare blue micromoon over the Temple of Poseidon at Cape Sounion on Sunday, May 31, 2026 [1].
This event is significant because it combined two rare lunar characteristics: a blue moon and a micromoon. While a blue moon is the second full moon to occur in a single calendar month, a micromoon happens when the moon is at its apogee, the farthest point in its orbit from Earth [2, 3].
The lunar occurrence marked the end of spring [1]. It was the sixth full moon of 2026 [2]. This specific alignment meant that both full moons occurring in May 2026, on May 1 and May 31, were micromoons [3].
Observers at Cape Sounion captured the moon rising over the ancient Temple of Poseidon [1]. The phenomenon was not limited to Greece, as it was also visible in New Delhi, India [4].
Astronomical events of this nature occur when the lunar cycle does not align perfectly with the solar calendar. Because the moon's orbit is elliptical, its distance from Earth varies, creating the visual difference between a supermoon and a micromoon [3]. The combination of the apogee and the calendar anomaly of a second full moon in one month makes the blue micromoon a rare sight for observers globally [1, 2].
“A rare blue micromoon was visible over the Temple of Poseidon at Cape Sounion.”
The occurrence of a blue micromoon highlights the intersection of orbital mechanics and calendar tracking. Because the moon reaches its apogee while appearing for the second time in a month, the moon appears smaller than average during a period that is already statistically infrequent, providing a unique opportunity for astronomical observation and photography at historic landmarks.
