Dr. Walter Albert Koch was born on September 18 1895 and died February 25, 1970, He developed his system for the Hamburg School, and Witte and the Uranians originally used it before they abandoned a house system entirely and went to their dial. It was originally named the “birthplace” system but has been used for other like Joyce Wehrmann’s gambling scenario. He did not release it publicly until 1964 and is today in America, at least the Koch system is a close second to the Placidus system and worldwide third behind the Argentinian Topocentric but it has one major flaw that has caused it from eclipsing all competitors, and that is the cusps are just as points on the ecliptic, and do not intersect it. This is problematic if the astrologer uses Primary Directions.
That said, the late Swiss astrologer Bruno Huber uses it exclusively in his work but that is okay since Switzerland, as does most of America, falls between the latitudes between 66N and 66S which is all Koch’s house tables define; for example Fairbanks Alaska is right at the limit at 64 North 50 while obviously the Artic Circle is outside of it.
The Alchabitius House system, made for the Middle East, has the same flaws. These two houses show why many astrologers pick a house system that works in their latitude and ignore births born outside of it. That though with all the immigration into Western Countries is becoming harder to do.
This series of charts is the Argentinian Regulus Professional Platinum Version 8.195 available for download for $220.00 and most of the documentation is in Spanish. I have found it awkward to use and as you see on these charts, hard to read thus for my money $220 is about $50.00 too high though I do like the Huber emphasis, but there just isn’t enough in here to warrant biting the bullet. They do give a nice set of radix charts for study, which is quite helpful. For example, Kepler gives you 3 without the $85.00 add-on.
The Harmonic Flower charts, shown both as radix and nodal, is pretty, as by the number of petals reflects the specific harmonic (e.g. 5 petals for the 5th harmonic, i.e. planets that are in quintile or biquintile aspect to each other) as each harmonic has its own color as shown by the key on the side, which of course is miniscule and so not as helpful as it could be.