Relating to or near the sun.
- It is possible that all the planetary orbs originate from an early attempt to record heliacal obscurity.
- All ancient astrologers placed the greatest significance upon heliacal risings and settings and ancient Mesopotamian astrology was also heavily predisposed to observance of this kind of planetary phenomena.
- The Greeks and Romans, with fairly useless calendars, continued to depend upon observing the heliacal risings and settings of stars.
Mid 16th century: via late Latin from Greek hēliakos (from hēlios 'sun') + -al.
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