Wow! Great article! It was an eye-opener. For all my life, I’ve been under the false impression of the “2 new-moons in a month” definition of a blue moon. Now, I now the truth: The third full-moon in a season of four full-moons is a true blue moon!
I’m quite pleased that Sky & Telescope has fessed up to their own errors from 1943 and 1946 which seems to be the cause of the blue-moon confusion.
Thanks for posting it.
Cheers
I went around and around with some people back in 1999 about the Blue Moon, too... :-)