"But I have seen some astrologers use it with the tropical zodiac and basically treating it like the "normal" charts"Yeah
Vedic Astrologers treat the 9th harmonic like a normal chart. The Navamsha chart is the 2nd most important chart after the Rasi chart. It's a 2nd main overall chart. It's not just used for marriage.
Because of that, I wondered if the same method can be used in western tropical Astrology.
I have a grand trine of Sun,Mercury,Neptune in 9th harmonic that seems to fit me. Of course, I have Mercury conjunct Sun/Neptune midpoint because it is in 27th harmonic (9 x 3 = 27).
According to David Cochrane,founder of Cosmic Patterns and creator of Kepler Astrology software:
Some of the key harmonics that influence cultural development are:
27 and 81: Spiritual enlightenment, going to heaven, becoming a saint, reaching perfection. Finding peace and bringing an end to war and hatred.
If we think of the number 27 in terms of a harmonic or wave form, it is 3 cubed, or 9 times three.
cosmic cybernetic wave of 9 times 3 emphasizes wholeness, acceptance, a world family, and peace.
In Martin Luther King’s birth chart we see beautiful 9th harmonic and 27th harmonic patterns that express his vision of a loving community and how he was drawn to the influence of Gandhi’s thinking and the path he took to bring about civil rights.
http://astrosoftware.com/CosmicCybernetics.htm
David Cochrane is really big on Harmonics. He has developed a harmonic astrological system called Cosmic Cybernetics.
I have his book about 21st Century Astrology.
Actually, I have a kite in the 9th harmonic. Uranus opposes Sun and sextiles Mercury and Neptune.
I have a t-square of Saturn square Sun-Uranus opposition in my 9th harmonic that also seems to fit me, especially in regards to my biological father.
but yeah ..some western tropical astrologers using the 9th harmonic chart as a regular chart is not farfetched. They are doing what the Vedic Astrologers do.
I wouldn't use the signs nor houses though. David Hamblyn was a harmonic astrologer. I have his book on Harmonic Astrology.
He is now a critic of Astrology. I can't help wonder if he got into Harmonic Astrology because he was critic of Mainstream Astrology. In his harmonic astrology system, the zodiac signs nor the houses were used.
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Raymond
Supporting the Neurodiversity Movement
A Different Mind Is Not A Deficient Mind.
http://people.tribe.net/4b0cf8c4-1fc3-4171-92d3-b0915985bf95/blog