On Friday, April 10, 2015 at 8:12:59 PM UTC-7, Lord Vath wrote:

The earliest pyramids were only built 4600 years ago. The stars
wouldn't have changed much.

You would be very wrong to believe this. The poles precess 360 degrees every 26,000 years, so 4600 years ago Thuban would have been the pole star, not Polaris...

http://robertbauval.co.uk/articles/articles/cciae.html