Nothing has changed. Someone seems to have suddenly ‘discovered’ that there is another system of astrology out there, which seems to happen every so often. What they are talking about is called Sidereal astrology. What most people in the Western world follow is called Tropical astrology, which hasn’t changed since Ptolemy. Basically, the zodiac elliptical was cut up into twelve 30 degree sections that were given a name, corresponding to constellations along the elliptic. They could have been named A, B, C. Doesn’t matter. It’s the same 30 degree sections. There are arguments for both, which can get quite heated, but they are different systems which operate differently. I personally study tropical astrology myself.