In an acronycal manner; at the moment when a star rises or sets at the same time as the sun.
From the adjective 'acronycal' with the adverbial suffix '-ly,' creating an adverb that describes the manner or timing of astronomical events.
This adverb appears in historical astronomy texts to describe precisely when observations should occur. It's one of those rare words that connects everyday timekeeping to the mathematics of orbital mechanics.
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