heliacal
adjective
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.
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Succeeding sovereigns spread their limits far, Tamed every tribe, and sooth'd the rage of war; Till Quito bow'd; and all the heliac zone Felt the same sceptre, and confirm'd the throne.
From The Columbiad by Joel Barlow