Has Stargate, the show, not the movie, ever given any kind of timeline for when the Goa'uld (specifically Ra) first came to Earth? The movie, as far as I can tell, says 10,000 years ago (this according to tests done on the coverstones that were found with the Stargate itself). However, actual archeology says that the Great Pyramid was probably built around 2600 to 2500 B.C.... closer to 5,000 years ago. Then there's the date given for the rebellion of Egeria and the spawning of the Tok'ra movement. In Crossroads, it's stated that the Tok'ra were created and Egeria was 'killed' by Ra about 2,000 years ago. This would seem to mean that the Goa'uld, under Ra, held dominion over Earth for at least 3,000 years, and the rebellion happened some time around the birth of Christ (this, of course, ignoring the date from the movie). However, by this time what we think of as 'ancient Egypt', the great Nile Empire, had been trod over by other civilizations and hadn't actually existed for about 1,000 years,
My head hurts.