I'm not big on knowing star constellations. I imagine the animals used to represent them came into use in ancient times say one or two thousand years BC. This author is saying that they were in use at GT say about 9000 years BC. I find it a stretch for cultures to keep using the same constellation figures over a 9000 year period but yet language fractured greatly into tongues neighbors cannot recognize.
Like, OMG... I just totally saw a shooting star go through the constellation Skinny Jeans.