The same as acronyc; relating to the setting or rising of a celestial body at the same time as the sun.
From Greek 'akron' (extreme) and 'nyx' (night), with the suffix '-al' added to form an adjective. This variant emphasizes the nighttime boundary condition.
This adjective form was essential in ancient star catalogs and navigation guides. Medieval scholars debated whether acronycal risings had astrological significance for agriculture and travel.
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