Astrology in Jewish antiquity (Hebrew: מזלות = mazalot) is the belief that celestial bodies can influence the affairs of individuals and of entire nations upon the earth. This involves the study of the celestial bodies' respective energies based on recurring patterns that change by the hour, by the week, month, year or by several years (time categories). In each of these time categories one of the seven planetary spheres (Sun, Venus, Mercury, Moon, Saturn, Jupiter, or Mars), along with the month's current Zodiac constellation, come into play and influence the sublunary world. At times, it involves a complex combination of several of these factors working together. In Judaism this belief is expressed by the biblical affirmation: "Knowest thou the ordinances of heaven? Canst thou set the dom