Whether one chooses, northern culmination of Galactic Center, OR southern culmination of Sirius, OR northern culmination (and pole star status) of Vega, OR best fit of Orion's Belt to the Great Pyramids, OR equinox sun moving into Leo ... each of those will yield slightly different dates for Zep Tepi, but they are all in the 10th to 12th millennium BC range.
--The first four of those five markers can yield precise specific dates, the fifth one (equinox sun moving into Leo) is only as precise as your chosen boundary for Leo. And all of those markers, astronomically speaking, because they are culmination points on a 26,000 year cycle would have been visually similar to their culminations for centuries. Graham, in Heaven's Mirror, discussed two of those markers -- Orion match to Pyramids and Sun into Leo. Bauval, way back in Orion Mystery, discussed Orion match to Pyramids. I, in The Origin Map, carefully recalculated the best fit time of Orion to Pyramids (actually two fit times depending on how you choose to fit it), and I also gave the year of culmination of the Galactic Center. Hancock and Bauval, in another book (have to look up exactly which) also mention the culmination of Sirius date. In Black Genesis, Bauval and I (actually it was my appendix), give the dates when Vega shown down the shaft under the Great Pyramid, and the near simultaneous date range of Sirius culminating on the south horizon as seen from Giza...
I don't remember off the top of my head all those precise dates; I (or you) need to look them up in our respective books. But as I noted, they are all in the same general epoch.
...Einstein once opined, "Never remember anything you know you can look up."!