
The type of Astrologian that you play in-game is a Sharlayan discipline.
(There exists a job in Ishgard which is titled "Astrologian" as well, but it involves far less casting of spells and far more looking at books to figure out when dragons are going to attack.)
I can also think off the top of my head of a number of artefacts and objects in the MSQ, created by Sharlayans, that do pretty unique things with the aether. (Not being more specific because spoilers.) The nation is basically a plot device factory.
(There exists a job in Ishgard which is titled "Astrologian" as well, but it involves far less casting of spells and far more looking at books to figure out when dragons are going to attack.)
I can also think off the top of my head of a number of artefacts and objects in the MSQ, created by Sharlayans, that do pretty unique things with the aether. (Not being more specific because spoilers.) The nation is basically a plot device factory.