Wednesday, December 22, 2010

What You Slept Through (Umbra)


As most of the people snugged into bed in the predawn of December 21st, the full moon escapes earth's shadow, as if emerging from a mist-blanketed lake. And unlike any other total lunar eclipse in 372 years, last night's lunar eclipse coincided with the winter solstice.

This is the beginning of the partial eclipse, the earth's umbra touches the outer limb of the moon. The pace quickens and the change is dramatic. The umbra is much darker than the penumbra and fairly sharp-edged.

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