Alderamin on the Sky

[KrayZ33]

They have canons, blackpowder is clearly a thing. At least people in the military should know about inventions and science, the whole setting and their military clothing suggest that they are somewhere between where we were during the 17th - 19th century.

Of course science isn't "science" during that time and a lot of things were actually stupid and wrong, but it's not like are anywhere near the medieval age anymore. The availability of books (and guns) suggests that it's at least ~1600+