I actually wanted to ask a similar question, if anyone would like to answer.

So, Astrology in FFXIV originated in Sharlayan, but I'd like to believe that astromancy was also used by the Allagans in a similar way too. The Allagan Star Globe is really the only in-game indication that this might have been a thing. Also, the Allagans were capable of space travel, so I'd imagine their interpretation of the stars would be at least somewhat different than how modern day Eorzeans understand them.

So my question would be: would the Allagans have treated astromancy with as much of a "mystic" air as modern Astroligans do, or were they more practical in its usage? Would they try to apply their magitek to astromancy?

I ask because I wanted to RP a character who finds an Allagan Soul Stone (in the form of some kinda technomagical virus) and learns Allagan Astromancy as a result. It wouldn't be inherently any more powerful than modern Eorzean/Sharlayan Astroligans, but would just be flavored in a different aesthetic, while still being recognizable as astromancy + magitek.

Sorry for my lore-bending questions, but I was rather curious.