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When is the moon full?

NASA photo 

Emily Johnston was looking out the window of her home in Westminster last night and she spotted the full moon. Or at least it looked like a full moon.

Then she checked her calendar. It told her the full moon isn't until today, Tuesday, the 22nd.

"So define 'FULL MOON.' I don't mean dropping yer drawers, either," she said.

It sure did look full last night, didn't it? It was a gorgeous night, with a brilliant moon, bright Mars overhead, lots of stars. If it hadn't been so darned cold, it would have been a perfect night for stargazing.

The moon is officially "full" when it is precisely opposite the sun as seen from Earth - sitting along a straight line drawn from the sun, through the Earth, to the moon. At that moment the side facing Earth is fully illuminated. That's where it was at 8:34 a.m. today, although it had already set for Marylanders. By the time the moon rises this evening at around 5:30 p.m., it will be nine hours past "full."  Last evening, it was about 12 hours or so short of "full."

But it doesn't really matter. It was big, bright and beautiful. BTW, the first full moon of the year is called the Moon After Yule, or the Old Moon.

Not much chance we'll see the moon tonight.

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About Frank Roylance
Frank Roylance is a reporter for The Baltimore Sun. He came to Baltimore from New Bedford, Mass. in 1980 to join the old Evening Sun. He moved to the morning Sun when the papers merged in 1992, and has spent most of his time since covering science, including astronomy and the weather. One of The Baltimore Sun's first online Web logs, the Weather Blog debuted in October 2004. In June 2006 Frank also began writing comments on local weather and stargazing for The Baltimore Sun's print Weather Page.
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