It's Definitely Pirates

Lominsan Astrologians The Lominsan branch of Astrology is still a very new and experimental branch of the secretive Sharleyan/Ishgardian tradition. Initiated by a senior Arcanist Skywatcher of Mealvaan's Gate discovering several Astrology texts and star-charts being used as fish wrapping after their daily walk home by the Fishing Guild, the novel idea of using the arrangement of the heavens as the guiding geometry and the familiarity of using astral navigation warranted further exploration. Unlike their distant cousins, Lominsan Astrology has a heavy navigational and short-term predictive bent, focusing on extrapolating the present and past by projecting their current state onto the cycle of the heavens via arcanum and predicting their future state by backprojecting their transformation through the tabulated movements of the stars. This, of course, is incredibly math heavy, having already produced several new mathematical theories and driven at least four (4) Arcanists insane from the long nights spent in the meeting room they've barricaded themselves in. The lack of access to examples of astrologian planispheres, arms, and even decks of cards has required Lominsan Astrologians to make do with jury rigging existing equipment into the vague facsimile of one, both out of necessity and to suit their needs. As such, Lominsan-produced astrologian arms are highly skeletonized and unadorned, and incorporate a minimum of a sextant, a compass, a chronometer, a barometer, a thermometer, a hygrometer, an artificial horizon, and a sundial, with more advanced prototypes incorporating theodolites for more precise surveying and to take advantage of the platform's stability. They still haven't quite figured out the cards portion of it, and many either use playing card decks or navigation star flash cards to varying degrees of success.

Casting Whereas the modern Arcanist and it's derivatives safely channel aether through amplifying geometries written in aetheroconductive inks, the relative nature of the heavenly geometries require that the user finally channel the backprojected aether-patterns through themselves and out into a usable form. As well documented in the many historical texts of the guild, this is extremely dangerous except for the most well disciplined or hardened practitioners. In all astral navigation, the observer is first and final point of reference.