Library Diodorus Siculus Library of History, Book II
Chapter 31
Chapter 31: Further on Chaldaeans
[4] Beyond the circle of the zodiac they designate p455 twenty-four other stars, of which one half, they say, are situated in the northern parts and one half in the southern, and of these those which are visible they assign to the world of the living, allow those which are invisible they regard as being adjacent to the dead, and so they call them "Judges of the Universe." [5] And under all the stars hitherto mentioned the moon, according to them, takes her way, being nearest the earth because of her weight and completing her course in a very brief period of time, not by reason of her great velocity, but because her orbit is so short. [6] They also agree with the Greeks in saying that her light is reflected and that her eclipses are due to the shadow of the earth. Regarding the eclipse of the sun, however, they offer the weakest kind of explanation, and do not presume to predict it or to define the times of its occurrence with any precision. [7] Again, in connection with the earth they make assertions entirely peculiar to themselves, saying that it is shaped like a boat and hollow, and they offer many plausible arguments about both the earth and all other bodies in the firmament, a full discussion of which we feel would be alien to our history. [8] This point, however, a man may fittingly maintain, that the Chaldaeans have of all men the greatest grasp of astrology, and that they bestowed the greatest diligence upon the study of it. [9] But as to the number of years which, according to their statements, the order of the Chaldaeans has spent on the study of the bodies of the universe, a man can scarcely believe them; for they reckon that, down to p457 Alexander's crossing over into Asia, it has been four hundred and seventy-three thousand years, since they began in early times to make their observations of the stars.
[10] So far as the Chaldaeans are concerned we shall be satisfied with what has been said, that we may not wander too far from the matter proper to our history; and now that we have given an account of the destruction of the kingdom of the Assyrians by the Medes we shall return to the point at which we digressed.
English translation by C. H. Oldfather, Loeb Classical Library (1933). Public domain. Digital text via Bill Thayer / LacusCurtius (University of Chicago).