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The Shadow of Your Earth

I can think of no better illustration of a full lunar eclipse than today’s Astronomy Picture of the Day. Several images of the Moon are superimposed at various stages of the eclipse, and you can clearly see the shape and size of Earth’s shadow. In a solar eclipse, the Moon’s shadow isn’t larger than the entire Earth, but Earth’s shadow is much larger than the Moon. (Quick vocabulary lesson: a shadow is called an “umbra”, and the fuzzy region around the shadow is the “penumbra”, meaning “next to the shadow”. Thus, “penultimate” is the next-to-the-last thing and an umbrella is a “little shadow”.)

And more links, albeit less beautiful ones:

Finally, here’s the latest splash test of the Orion capsule from NASA Langley Research Center (I saw an earlier test last month):

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1 Response to “The Shadow of Your Earth”



  1. 1 Happy Birthday, Johannes Kepler! « Galileo's Pendulum Trackback on December 27, 2011 at 18:02
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