Relating to, characteristic of, or resembling an astrolabe or its use in astronomy and navigation.
From astrolabe + '-ical' (adjective suffix meaning 'relating to'). A scholarly adjective used primarily in historical and scientific contexts to describe things connected to astrolabes.
This is the kind of hyper-specific adjective that medieval scholars loved—'astrolabical operations' sounds fancy but just means 'things you did with an astrolabe'—academia has always had verbose ways of saying simple things!
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