The ancient Babylonians based zodiac signs on the constellation the sun was "in" on the day a person was born. During the ensuing millenniums, the moon's gravitational pull has made the Earth "wobble" around its axis, creating about a one-month bump in the stars' alignment.
It wasn't a sudden change. They just didn't update the chart until now. So people have been going by the wrong signs, according to everything i've read about it.
The ancient Babylonians based zodiac signs on the constellation the sun was "in" on the day a person was born. During the ensuing millenniums, the moon's gravitational pull has made the Earth "wobble" around its axis, creating about a one-month bump in the stars' alignment.
It wasn't a sudden change. They just didn't update the chart until now. So people have been going by the wrong signs, according to everything i've read about it.