Any chart calculated for a specific time and place. A Natal chart is calculated for the time and place of a person's birth: A Transit chart calculates the position of the Planets at a specific time and place (such as an specific event). A Progressed chart calculates the position of the Planets at specific time and place and places these "progressed" positions of the Planets within the Natal chart. This gives valuable information on how the present positions of the Planets are affecting any person's unique natural patterns. The intent of this guide is to present the basic concepts of Astrology, so we shall only mention that there are several different methods of progressing a chart. See Progression