Simplicius, (who quotes Porphyry,) de Coelo, l. ii. com. xlvi p. 123, lin. 18, apud Marsham, Canon. Chron. p. 474, who doubts the fact, because it is adverse to his systems. The earliest date of the Chaldaean observations is the year 2234 before Christ. After the conquest of Babylon by Alexander, they were communicated at the request of Aristotle, to the astronomer Hipparchus. What a moment in the annals of science!