From the ancient world we find the roots of many of our modern astrological predictive techniques: transits, progressions and directions, solar returns. Planetary period (or chronocrator) systems, however, fell by the wayside, and that’s unfortunate, for they look at human time within a different context and can give insight into about changes in a person’s life.

This talk focuses on decennials, for which there are many documentary sources. It shares the nuts and bolts of this technique, provides comparisons with other planetary period systems from antiquity, and gives examples of their operation.