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heliacal rising

the rising of a celestial object at approximately the same time as the rising of the sun
the date at which such a celestial object first becomes visible in the dawn sky
Word Origin
C17: from Late Latin hēliacus relating to the sun, from Greek hēliakos, from hēlios the sun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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