ACHRONICAL, in Astronomy, is applied to the Rising of a Star when the Sun sets; or the Setting of a Star when the Sun rises. See RISING, and SETTING.
The Achronical Rising of Mars, who is then found to be nearer the Earth than the Sun, has been one great Occasion of exploding the ancient Ptolemaic System, which places the Sun in the Centre of the World, and Mars beyond the Sun. See EARTH, MARS, etc.
The Achronical is one of the three Poetical Risings and Settings of the Stars. See POETICAL.The Word comes from the Greek a, and xpiic, Time.
