I am taking that into consideration. Ancient records (where you can find them) are not all that accurate. I have read several accounts that conjecture that Halley's Commet may have been the Star of Bethlehem.
Good Grief, I don't think they even have George Washington's birthday accurate. It's actually a different day from what we celebrate. And that was less than 300 years ago
Yeah, but IIRC, that's a matter of eleven or twelve days (and only because we changed calendars), not 12-18 years.