The list is broken down into the two top categories, subject to revision, of Historical and Astrological:

Historical

• Wars
• Major Legislation
• Elections
• Popular Events
• Other phenomena

Astrological

• Ingresses
• Eclipses
• Outer Planet Quadrature Alignments
• Comets

An Ongoing Process

History, of which this project is an ongoing process--History Never Gets Old ( I made that up)--so this list will keep growing. Plus, what are the limits? Should we use Columbus discovery of the New World? Why not? It's just an experiment.