heliacal

Words with a similar base: heliacal

'heliacal'

[heliacal.a.01] as in: 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

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Examples:
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)