"Each planet takes a certain amount of time to travel thru all 12 signs and return to its original position in any given chart. The Moon takes only a month. The Sun takes a year. … Mercury and Venus stay close to the Sun, so their cycles through all signs are close to the Sun’s. Mars takes longer about two years...Jupiter takes about 12 months to complete a full cycle thru all 12 signs. Saturn takes 28-30 years to complete a full cycle. Because Saturn is a symbol of the wisdom which grows with age, its cycle is particularly important in reflecting our development. Every seven years, Saturn completes a a quarter of the cycle, and we move into a new stage of awareness."