Why was the correctly named Astronomy tech renamed incorrectly to Astrology?
Astrology is the more correct term for the era, encompassing both the scientific and mystical aspects. These didn't start to diverge until the 10th century in the Islamic World, and not until the 17th century in Europe. Nowadays Astrology is a purely mystical term, but for most of history it was the entire field of study, and Astronomy was just one component of that. I don't have dedicated Astronomy tech in the tree (tried, but just didn't work) but it's emergence as a discipline in its own right is represented by Optics -> Scientific Method + Geography -> Physics.
EDIT: The reason why there was an Astronomy tech in the Ancient Era prior to 1.24 is that there was also a Divination tech. That's gone now though, so the broader definition of Astrology was needed.
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