While Rudhyar's Lunation Cycle is considered by many to be "the book" on this topic, the best book by far is Marc Robertson's Engine of Destiney. This book offers eight planet pairs, each of which is analyzed through its eight phases.
This book introduced me to an approach in which I scan a chart for several phase-pairings and am able to grasp an initial assessment and understanding of the chart in less than a minute. I can then start focusing upon other typical chart investigations. The end result is being able to look at a chart and immediately start talking the chart and asking relative questions. This book was not one of the 350+ books I threw away several years ago. Dave
I just realized I have this book, but it was invisible to me on the shelf because a) it's almost of pamphlet size (with no spine text it's hidden among its bulkier brethren), and b) the "Engine of Destiny" title is bracketed by a much larger "Cosmopsychology" at the top of the cover and followed by "Planets & Personality," and none of the various titles say a word about the lunation cycle. I dug it out for a re-read since I bought and read it around 1974 and haven't looked at it since; I also dug out my old "phase-finder" wheel, which looks much like the "continental" chart form at the back of the book. As an extension of this theme, books on the eclipses (special cases in the lunation cycle) by Robert Carl Jansky and Sepharial (a reprint from 1915) jumped out at me, demanding attention. Looks like deep water ahead
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ETA: In looking closely at the "phase-finder" wheel (that came from the same publisher as "Engine of Destiny"), I notice that it refers to a couple of additional books/publications that describe phase meanings:
"Not a Sign in the Sky" by Marc Robertson
"The Spiral of Life" by Jinni and Joanne
"Astrology, the Cosmic Pattern," part of a correspondence course by Joanne Wickenburg (the same Joanne?) and probably not readily available unless captured in her later published work
I don't have any of these so can't speak to their value.