"Primary directions were dropped by most modern astrologers"
As Cochrane mentioned in his video, Primary Directions, which was the most popular technique since the first century A.D. faded in popularity ONLY in modern times AND ARE NOW BEING REVIVED". Cochrane mentioned that he got a lot of requests to explain P.D. I have count at least 14 programs that Primary Directions are part of it or the main part, some of them are free software.
Cochrance's videos on P.D. are excellent, but it is a pity that he doesn't include in his program Sirius the Primary Directions in Topocentric system as was developed by Kuhr, Polish, Page and Marr.
In the last years Juan Revilla add to his free program Riyal the Topocentric version.
So, while there are many astrologers that seek only the easy systems like transits, secondary, solar arc, there are a lot of young astrologers that show increasing interest in P.D.
"1) There is little agreement on what exact arc distance is the equivalent of "1 year", lack of total agreement as to what "1 year" means, or how to even apply the underlying assumptions/metaphor (calculate them).
- Naibod equivalency: 1 degree of arc = 1.0146 years of life
(360° circle divided by 365.2422 days)
- Cardan: 360 / 365 = 1.0135
(Naibod and Caran were applying Right Ascension to their notion of culminating measures)
- Ptolemy 1° = 1 years of life
- Kolev uses length of Mean Lunar Year: 1° = 0.9844 years of life
- Kepler and Placidus interject others considerations
(Video by David Cochrane, programmer -
https://youtu.be/Lb0ph6RUDxg)"
The originators of P.D. in Topocentric system has solved this problem years ago: only Naibod key is the correct one. Many years of work made by Marr, Estadella, James Alexander and mine research with thousands of events confirm this.
"2) Inconsistency in correlations/results."
Incorrect. See Predictive Astrology by Juan Estadella, 2nd edition, Appendix II
"3) If the radix is not accurate to within just a few minutes arc, then the entire edifice of a primary progressed chart falls apart."
True, but the same for the other popular technques like secondary: the most important aspects are the angular aspects, that is, for MC and Asc and if one doesn't have the exact MC, one simply can't see these aspects. In other words, each chart need a rectification- or you simply work on "out of focus" chart.
James Alexander demonstrated the primary directions in his chart; he gave only one aspect to each event while in practice there are several events with 2 appropriate aspects and even 3 aspects. . James' birth time was carefully recorded by his grandfather and even published it in the local newspaper. For many years he tried to rectify his chart, but only with P.D. in Topocentric he was successful and validated it with at least 4 other systems: secondary, PSSR, transits, age harmonics.
In which other system you can see Desc 180 Node for his first marriage and Desc 180 Venus for his second marriage with so tight orbs, just to mention 2 events… you can't.
I checked all the 14 events (except no 14, trip to Italy- don't have the date) with secondary directions:
1. Grandmother died
Converse Venus 120 converse Neptune 0'
Converse MC 90 Mars 3'
2. Second marriage
Converse MC 180 Venus 8'
3. Son born 30 Aug 2001
MC 60 Jup
4. Step Father died
Converse MC 0 Saturn 2'
No other secondaries with angles or houses. So, if one is trying to rectify his chart with only the secondaries- I would say that he is in trouble, especially if one is refusing to use the converse mode…