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5As these signs are twelve in number, each occupies a twelfth part of the heaven, and they move continually from east to west: and through them in a contrary course, the moon, Mercury, Venus, the sun itself, Mars, Jupiter and Saturn, as if ascending, pass through the heavens from west to east in different orbits. The moon making her circuit in twenty-eight days and about one hour, and thus returning to the sign from which she departed, completes the lunar month.
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