In astronomy, relating to a star or celestial body rising or setting at sunrise or sunset; occurring at the extremity or beginning of a cycle.
From Greek akron (peak/summit) and the astronomical suffix -ic, used by ancient astronomers to describe star positions at day's beginning or end.
Astronomers used this term to track when stars appeared at the horizon at dawn or dusk—it's a poetic word connecting the Greek concept of 'peak' to the peak moments of day.
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