A set of methods for creating a new astrological birth chart based on a combination of the original birth data (date, time, location) and the current date. The most popular method is to draw up a chart that is one day later than the original for each year a person has been alive. This chart, also known as a progressed horoscope, is used to indicate influences for the current year, as opposed to the influences at birth. While this may seem arbitrary, it has been used successfully for centuries. Often used with transit charts.