- heliac as an adjective:
- 1
heliac
adjective
1 heliac
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).
synonym: heliacal.
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