
Moon Twice in a Month: Why the Blue Moon Captivates Us
Space.com explains that a Blue Moon is not literally blue; it refers to either the second full moon in a calendar month or the fourth in a season with four full moons; the article traces its pop-culture roots—from a 1940s Sky & Telescope misinterpretation to songs and films—and notes that the Moon's enduring appeal comes from its regular cycles and its place in human culture and science.




