Relating to the rising or setting of a star at the same time the sun rises or sets, making the star invisible.
From Greek 'akron' (extreme/peak) + 'nyx' (night), meaning occurring at the extremity of night; used in ancient astronomy.
Ancient astronomers had specific terms for different star visibility patterns, and this word captures a precise moment when a star and the sun align so perfectly that the star vanishes in the solar glare—it's the ultimate cosmic hide-and-seek!
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