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320 pages, Hardcover
First published January 1, 2006
Over a period of an hour or so, the astronomer fills the laptop's hard drive with sequence after sequence of video, each one consisting of perhaps 2000 individual color frames. The processed pictures from each sequence can then be put together in an animation, showing the speeded-up rotation of the planet. Just a few years ago, such a feat would have challenged astronomers using even large telescopes. Today, it's all in a night's work for an amateur under light-polluted skies, in a small corner of a metropolis.