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: heliac.

Roget 318: cosmic, cosmical^†; mundane, terrestrial, terrestrious^†, terraqueous^†, terrene, terreous^†, telluric, earthly, geotic^†, under the sun; sublunary^†, subastral^†.    solar, heliacal^†; lunar; celestial, heavenly, sphery^†; starry, stellar; sidereal, sideral^†; astral; nebular; uranic.    ... show more