|heliacal rising (hɪˈlaɪəkəl)|
|1.||the rising of a celestial object at approximately the same time as the rising of the sun|
|2.||the date at which such a celestial object first becomes visible in the dawn sky|
|[C17: from Late Latin hēliacus relating to the sun, from Greek hēliakos, from hēlios the sun]|
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