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heliacal rising

noun
  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
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012