Definition
Heliac is closely related to 'heliacal,' also referring to the sun, especially in the context of the rising or setting of a star or planet. It's often used to describe the first visible appearance of a star just before sunrise after a period of being hidden by the sun's glare. Think of it as a celestial 'coming out party' for a star. It's a specific astronomical term, often used in historical contexts to understand ancient calendars and agricultural practices. It's all about timing with the sun's movements.