heliacal

he·li·a·cal  (h-l-kl)

adj.

Of or relating to the sun, especially rising and setting with the sun.

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[From Late Latin hliacus, from Greek hliakos, from hlios, sun; see swel- in Indo-European roots.]

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he·lia·cal·ly adv.

Thesaurus

Adj.

1.

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; "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)" heliac