heliacal

heliacal

[hi-lahy-uh-kuhl]
adjective Astronomy.
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.
Also, heliac [hee-lee-ak] .


Origin:
1600–10; < Late Latin hēliac(us) (< Greek hēliakós; see heli-1, -ac) + -al1

heliacally, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

heliacal
"pertaining to the sun," 1607, from Gk. heliakos "of the sun," from helios "sun" (see sol). The heliacal year is reckoned from the heliacal rising of Sirius; it is also known as the canicular year.
Online Etymology Dictionary, © 2010 Douglas Harper
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