Relating to or determined by the sun; especially referring to the heliacal rising of stars in ancient astronomy.
From Greek 'heliacos,' derived from 'helios' (sun). The term developed in ancient astronomical practice to describe celestial phenomena related to the sun's position.
Ancient astronomers tracked the 'heliac rising' of Sirius—the moment when a star became visible just before sunrise—and it was how Egyptians predicted the Nile's flooding, making the sun's position a literal life-or-death issue!
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