In addition to Phil Plaitt’s Bad Astronomy post on the rejiggering of astrological signs and the possible addition of Ophiuchus, can I just add that the constellations themselves are an arbitrary, human construct? Ptolemy had 48. We have 88.
For example, it’s our convention that the three stars in Orion form the belt of a warrior, but we could have combined some asterisms in that general area together differently to form, say, two separate constellations. Anyone who’s spent time with a star chart can see that some of the groupings are more-or-less a random collections, or at least they appear that way without a history lesson. So, of course, it’s beyond silly to think that the position of the sun traveling through our imposed arrangement of stars could have any impact on human life.
No matter. We’re still going to have to listen to a bunch of “why have scientists done this” horseshit about a constellation that’s been named since the dawn of civilization, apparently because whoever’s in charge of the astrological mumbo-jumbo just discovered precession.