Requirements
To use ASTROCHRONOLOGY, you'll have to download the de440.bsp, de441.bsp, and sb441-n16.bsp ephemeris files from NASA and place them in the same folder as the application (see the Guidebook for details). However, ASTROSEARCH works without them.
Required Ephemeris Files
Guide
The "Solar System Guidebook" contains an introduction to astrology (and Astrochronology). It's 51 pages (8 mb).