Shouldn't academy have been built in Thebes?
Anyway we got Astronomy. I traded Astronomy to Catherine for Gunpowder + loose change, then pulled a diplomatic coup with it:
Astronomy to Cyrus for 510 gold + world map
This made Cyrus happy (+4) with us for good trade relations
I then asked Cyrus nicely to convert to Confucianism, and he does!
Relations with Cyrus are now at +9 and only Asoka is still Buddhist so it's not important anymore. I don't think Cyrus will backstab us.
Built cottages and health improvements in Thebes Memphis Heliopolis.
I then researched Scientific Method since Diplo victory now looks feasible, everything else has no trade value, and it's difficult to justify why we researched astronomy otherwise

It finished at the end of my turnset one turn earlier than expected, unfortunately breaking a couple of monastery builds. Catherine will offer us either Replaceable Parts or Chemistry + 120 gold for it, next player can choose which.
Sold our extra cow to Caesar for 4gpt, and some clams to Asoka for 6gpt.
We should sell stone to Catherine too after we built oxford, and if we give Caesar economics that should get him to Friendly.
We are up to #2 in both GNP, population and score and AI research will be slowing down as their GP production enters diminishing returns. Set research tentatively to physics as I can see diplo being a feasible win condition now too. Again next player can change that. (I think we would have to build spies and disconnect Cyrus' resources to disrupt his trading deals though, to win this way.)
We should really discuss about our next moves, our position actually looks pretty decent now with Cyrus invasion threat removed.