For a given fixed star there are four major events in its synodic pattern that we will consider here--four significant positions it can have relative to the rising and setting of the Sun: The Vocabulary of Synodic Star Cycles: Heliacal and Achronical Heliacal rising: 1.
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relative to the rising and setting of the Sun: The Vocabulary of Synodic Star Cycles: Heliacal and Achronical Heliacal rising
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