How noticeable would it have been when it first came into view? It would have barely cleared the horizon before setting a few degrees away. An interesting coincidence has been noted and seized upon, I think.
No, it was very noticeable because it was part of a constellation. This has been written about in an excellent book, “Hamlet’s Mill”.
“How noticeable would it have been when it first came into view?”
That’s a good question. Due to precessional effects, my initial research shows that it’s actually pretty damn impressive. Very bright, just over the horizon at 9500 BC, but I need to check more closely the coordinates
Earliest rise of Sirius then would be around August 15th, rising at about 6am. Almost due south.
Today its the 7th. The location has moved from due South to ESE.