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Definitions:
Adjective
heliacal
heliac
Definition: 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; "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)"
Definition: Of or relating to the Sun, especially rising and setting with the sun.