A new version of the 3D heavens Stellarium software is now available, including a “paleolithic sky culture and landscape”, two new ancient Babylonian ones, and medieval and modern Chinese sky zodiacs. It’s the leading free / open source software for such things, that’s also easy for clueless newbs like myself to use.

You can also zoom back in time with Stellarium, making it rather useful for historians trying to date and geographically locate a text that has astronomical / sunrise-sunset time statements in it. My latest use of it in that way was for my Sir Gawain book. It doesn’t yet include comet positions.