I am not saying that Astrology wasn't. I am pointing out that it isn't technology. Even if you consider a science, which it was at the time.
If you think of it as 'primitive astronomy' it makes sense. It required organized observation and recording of celestial phenomena, discovering and recording the relationships in the movement (and the mathematics to calculate future movements): all mental and physical disciplines still useful in scientific study. The fact that the motivation for these disciplines was bogus doesn't make the disciplines so. Also, it resulted in some serious astronomical data being collected by the Babylonians, Chinese, and Mesoamericans that was applied to things like calendar making and solar/lunar eclipse predicting.
What is far more troubling is the Placeholder type titles and misplacement for some of the 'technologies':
Military Tactics in Medieval Era? That will come as a real surprise to all the armies practicing tactics a thousand years or so earlier: like Romans, Macedonians, Chinese, Persians, etc.
Stirrups as an important technology? Sorry folks, it Just Ain't So. They are required to use a couched lance as in a medieval knight, but you might look up the US Army evaluations of the Native American horsemen they fought in the 1800s - none of whom used stirrups. You'll find the phrase "finest light cavalry in the world' shows up a LOT!
Apprenticeship as a Technology? Now THAT is an example of a Social System, not a 'technology' - youngsters were being apprenticed to artisans within or without the family since the Bronze Age: the Medieval Guild system formalized the system, but it didn't require any new technology, just a different social system.
Castles as a technology? Here we go again. All the various 'castles' in different societies all had the same basis: an Aristocrat (or 'thief with an army') whose wealth was based on land, wanted to be able to sit on that land and guard it, rather than loaf around in the nearest city. So he built a fort, used it to protect the land and the wealth he got from it. That the castles eventually developed into elaborate stone fortifications was a side effect of a peculiar social and economic situation - the same fortification techniques were applied to cities even more elaborately...
Neither
Flight nor
Advanced Flight require
Combustion. Advanced Flight does require
Radio, which requires
Steam Power - which was tried to power flying machines, and in numerous spectacular and frequently fatal incidents, failed to work...
I could go on, but this Tech Tree makes my head hurt almost as much as the Civ V tree did...
per turn means the tech costs 1200 
