In a manner relating to or determined by the heliacal rising of a celestial body; in reference to the sun's astronomical position.
From 'heliacal' plus the adverbial suffix '-ly,' creating an adverb form. The term maintains the Greek astronomical terminology while expressing manner or method of observation.
When astronomers say something happens 'heliacally,' they're speaking in the direct language of ancient sky-watchers—it's a technical adverb that preserves Greek astronomy's most practical observation method!
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