Science
‘Once in a Blue Moon’ – VOA Learning English
The NASA website says that “since the 1940s, the term ‘blue moon’ has also been used for the second full moon in a calendar month.” This usually happens only every…

And now, Words and Their Stories, from VOA Learning English.
On this program we take an English word or expression and explore it a little deeper. Today we are talking about a lunar phenomenon a moon event. Its called a blue moon.
Blue moon you saw me standing alone
Without a dream in my heart
Experts at the U.S. National Aeronautics and Space Administration (NASA) explain this lunar event. They say a blue moon is the “extra moon in a season with four full moons.
The NASA website says that since…
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