@Felthry If I had to guess, when Europe became prominent. Tropical climates only really have 2 seasons, wet and dry. Ancient Egypt had 3, determined by the behaviour of the Nile. I'm having trouble finding out what ancient China did.
@KamareDrache I know four seasons feature prominently in chinese poetry and literature but i don't know about *ancient* china
-F
@KamareDrache yeah the question is does it predate european contact with china
china's a big enough place that it covers lots of climates, and i'm sure some of them have four seasons as distinctly as europe does, so it wouldn't be too surprising
-F