1. heliac, heliacal

pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun

Example Sentences:
'the heliacal rising of the Dog Star'
'the heliacal or Sothic year is determined by the heliacal rising of Sothis (the Egyptian name for the Dog Star)'

Synonyms

• heliacal