heliacal


adjective Astronomy.

  1. pertaining to or occurring near the sun, especially applied to such risings and settings of a star as are most nearly coincident with those of the sun while yet visible.
adj.

“pertaining to the sun,” c.1600, with -al (1) and Greek heliakos “of the sun,” from helios “sun” (see sol). The heliacal year is reckoned from the heliacal rising of Sirius; thus it also is known as the canicular year.

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