Skywatchers in Australia and the U.S. can view a rare blue micromoon peaking Sunday night, May 31, 2024 [1].
This event is significant because it combines two rare lunar phenomena: a blue moon and a micromoon. While a standard full moon occurs monthly, this specific alignment creates a visual experience that happens infrequently across the globe.
A blue moon is defined as the second full moon to occur within a single calendar month [2]. In this instance, it is the second full moon of May. Simultaneously, the event is a micromoon, which is the most distant and smallest-looking full moon of the year [3]. This occurs when the moon is at its furthest point from Earth in its elliptical orbit.
The moon will be visible across Australia and in various parts of the United States [4]. For observers in South Carolina, the peak viewing time is 4:45 a.m. Sunday [5].
There is conflicting data regarding when this specific combination will recur. Some reports said the event will not happen again until the end of 2028 [3]. Other sources said the phenomenon will not return until 2066 [6].
Observers do not need specialized equipment to see the event. Because it is a micromoon, the moon will appear slightly smaller than average, though the difference is often subtle to the naked eye [3].
“A blue moon is defined as the second full moon to occur within a single calendar month.”
The blue micromoon highlights the intersection of the lunar calendar and orbital mechanics. While 'blue moon' refers to the frequency of full moons in a month, 'micromoon' refers to the moon's physical distance from Earth. The discrepancy in predicted return dates—ranging from 2028 to 2066—underscores the complexity of calculating the exact overlap of these two distinct astronomical cycles.
