Curiously, even though the Babylonians reported many details of celestial phenomena, the astrologers of Babylon are said not to have relied on actual observations.
According to a leading expert, “The existence of Babylonian omens for eclipses beginning and clearing in all four directions, or areas of the moon, despite the fact that a lunar eclipse will never begin on the western edge of the moon, indicates a lack of concern with observational veracity in favor of schematic order.”1
But there is another explanation that makes more sense of what the Babylonian astrologers were up to.