astrology signs dating

What are the real dates for astrology signs?

I’ve heard that the dates in the magazines aren’t the real dates because those dates were from thousands of years ago and the positioning of the planets have changed since then. Is that true? I’ve seen two different lists of dates for astrology signs and I just wanted to know what the real dates were.

http://en.wikipedia.org/wiki/Sidereal_astrology

Dating by Zodiac Sign : How to Date a Cancer

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