The "change" didn't occur all at once or recently, the "change" has been occurring since the Babylonians and Egyptians devised the signs/ecliptic segments 2000 to 3000 years ago. There is no fixed place in time where there was a "change". Some poorly written blogs seem to be perpetuating the idea that someone redesigned "the signs" recently, or that "scientists" discovered a "shift" in the Earth recently (I keep seeing the date of 2009), but nothing out of the ordinary has occurred. This all started with an article in Minnesota Star Tribune where some astronomer pointed out that the "signs" don't line up with the time periods where the sun is within their namesake constellations. This is old news, they haven't lined up for thousands of years. Astrologers were even aware of this, and it's part of astrology's mythos.. that the "sign" in which the sun rises during the Vernal Equinox (usually ~March 21st) denotes the "age".. which I believe is currently Aquarius (according to my 60's/70's crap-pop song collection, anyway). So this story passing around is wrong on it's astronomical facts, and it's wrong on it's astrology facts.. which is fairly astounding.