— heliacally , adv.
/hi luy"euh keuhl/ , adj. Astron.
pertaining to or occurring near the sun, esp. 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'/ .
[ 1600-10; heliac ( us ) ( heliakós; see HELI- 1 , -AC) + -AL 1 ]