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A bit more research shows that the sun has indeed always gone through Ophiuchus. That has nothing to do with axial precession, and everything to do with the ancients wanting a nice division into 12 constellations, and let's face it, Scorpio is way more recognisable. so while they knew about Ophiuchus, they simply left it out. The Axial precession only relates to the changed dates of when the sun is in each constellation, even though the actual path hasn't changed that much. it's a 26,000 year cycle, IIRC, so that's to be expected, I guess.
Cheers
Markus
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