Seth Shostak Quotes
The bottom line is that the position of the Sun relative to the stars slowly changes for any given date, and over the course of 26,000 years, it can easily slide between constellations. So you may think you're a Pisces, but you're actually an Aquarius.
Citations
Shostak, Seth. Confessions of an Alien Hunter: A Scientist's Search for Extraterrestrial Intelligence. National Geographic, 2009.
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Seth Shostak is an American astronomer and author, and is currently the senior astronomer for the SETI Institute.