Marc Jones starts off How to Learn Astrology with an enigmatic chart for Martin Luther, a cleric that he held in great esteem. There was a lot of research to uncover the basis for the chart, when asked Jones would say, “figure it out yourself,” and when this project was just starting, we did. Next the question was what house system did Marc use? He was a major proponent of the Placidean, but that did not match the chart in the book. It took some while when discovered he used Luther’s friend Regiomontanus’s method, which coincidentally is the same that…