The New American Ephemeris for the 21st Century 20002100 at Midnight Michelsen Memorial Edition Compiled and Programmed by Rique Pottenger based on the earlier work of Neil F Michelsen Memorial text and Introduction compiled and written by Maria Kay Simms In 1976 Neil F Michelsen 19311990 compiled programmed and published the first edition of The American Ephemeris that set new standards of accuracy for contemporary astrology. In 2006 celebrating the 30th anniversary of first publication of the first volume of work that grew to become Michelsens comprehensive American Ephemeris series Rique Pottenger continued the work that Neil began. Within The New American Ephemeris for the 21st Century 20002100 at Midnight is the familiar data and format long used and trusted by astrologers worldwide now updated and expanded with new features.