"Blue moon" appears in the night sky

At the beginning of October, the bright moon on the night of "double festival" must have left a good memory for many people. At the end of the month, another full moon will rise into the night sky. This time, it also has a romantic name - "blue moon".

Photo: on the night of October 1, the full moon of the Mid Autumn Festival is full, and the full moon of ancient houses in Fuzhou sets off an interesting contrast. Photo by Wang Dongming, China News Agency

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"Blue moon, you see me wandering alone, with no dream in my heart and no lover beside me; blue moon, you know I'm there, and you can hear me singing for the people I care about." The lyrics are derived from the classic American pop song blue moon.

When it comes to "blue moon", people may think of the same scene as this song, with a trace of sadness in romance.

Photo: blue moon captured in Macedonia.

But in fact, this poetic name has nothing to do with the color of the moon. It refers to a special phenomenon in the astronomical calendar.

If there are two full moons in a calendar month, the second full moon is called "blue moon".