As the planets travel through the sky every day, they move past the places where they were in your natal birth horoscope. Transits are the relationship of the planets’ current position as compared to where they were when you were born.
Some transits help you to get into the flow of life; others challenge you to work through growth issues. Many people see an astrologer on a regular basis in order to get “updated” on how the transiting planets are activating their natal chart.
For example, near your birthday each year, the Sun returns to the same degree of the sign of your birth. A chart is then cast, called a Solar Return, to help you understand the changing cycles of the year ahead.