Progressions

Any of a number of systems that advance the birth date using proportionate astronomical cycles. Progressions equate "progressed" planetary positions on an event date (usually a current date) to those which occurred at some other time (usually the birth moment). For a birth chart, the planetary positions at an epoch are related to an event date so that the differences (epoch-birth) and (event-birth) are in a specified, fixed ratio.

(- Matrix Software, Astro*Index)