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  • "The rising and setting of a star or planet is said to be acronical when this phenomenon happens just as the sun is descending below the horizon.

    "The acronical is one of the three Greek poetical risings and settings of the stars; and stands distinguished from Cosmical and Heliacal: and by means of which, for want of instruments and accurate observations, they regulated the length of their year."

    Falconer's New Universal Dictionary of the Marine (1816), 4

    October 11, 2008