Seth Shostak quote

Thanks to the fact that the Earth isn't a perfect sphere, and invoking a bunch of Newtonian physics, you can deduce that our planet wobbles, too, taking roughly 26,000 years to trace out a small circle on the sky, a phenomenon known as precession.
Seth Shostak

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Confessions of an Alien Hunter: A Scientist's Search for Extraterrestrial Intelligence
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