When a transiting planet comes back to the same degree it was at the time of your birth, it opens a new chapter in your life. A cycle begins, with fresh growth opportunities and new life lessons to experience. The nature of that planet determines what those will be; the movement of the planet determines the length of that cycle.
Think about your birthday. Each year has a certain vibe, and often the events that unfold around your birthday can establish the main themes of the following 365 days. This is your Solar Return, and it happens every year, as it takes the Sun 365 days to return to the degree it was at the time of your birth.
The personal planets (Sun, Moon, Mercury, Venus, and Mars) move more quickly and make their returns sooner than Jupiter, Saturn, Uranus, Neptune, and Pluto. The Moon returns once a month, the Sun once a year, Mercury and Venus a little less than a year, and Mars every two years. The more distant planets orbit the sun more slowly. As a result, these planetary returns can mean big changes in your life. At times, they may even feel like crisis points, as you close one chapter and start a new one. They can also mark significant turning points in your life.
The Saturn Return happens every 29.5 years, and it is one of the most significant planetary returns. The choices you make during your Saturn Return year will have lasting consequences, for better or worse, for years to come.