6

　　New Year's Day, making January a blue moon month for them.

　　However, the Eastern Hemisphere can celebrate with a partial lunar eclipse（月蚀） on New Year's Eve when

　　7

　　of the moon enters the Earth's shadow. The

　　8

　　will not be visible in the Americas.

　　A full moon occurs

　　9

　　29.5 days, and most years have 12.

　　10

　　, an extra full moon in a month - a blue moon - occurs every 2.5 years. The

　　11

　　time there was a lunar double take was in May 2007. New Year's Eve blue moons are rarer, occurring every 19 years. The last time was in 1990; the next one won't

　　12

　　again until 2028.

　　Blue moons have no astronomical

　　13

　　, said Greg Laughlin, an astronomer at the University of California, Santa Cruz.

　　"`Blue moon' is just a

　　14

　　in the same sense as a `hunter's moon' or a `harvest moon,'" Laughlin said in an e-mail.

　　The popular definition of blue moon

　　15

　　after a writer for Sky & Telescope magazine in 1946 misunderstood the Maine Farmer's Calendar and marked a blue moon as the second full moon in a month. In fact, the calendar

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