Any source that would explain WHEN the zodiac changed?

I've heard/read a lot that the 'new' zodiac signs won't apply to people born before 2009.

ANY RELIABLE SOURCE?Any source that would explain WHEN the zodiac changed?
It is change in sidereal astrology only.



The change happened over the last 3000 years. If you use sidereal and say the change is not for people before 2009 then it is just arbitrary.Any source that would explain WHEN the zodiac changed?
http://news.yahoo.com/s/yblog_thelookout鈥?/a>

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