Therese Hamilton wrote:
I'm very happy to have this information, Mark. Thank you! You and others might find the full quote from B.V. Raman's A Manual of Hindu Astrology (Raman Publications 1935-1972) helpful, so I will give it here. I had left out a few words so as not to distract from the central issue. But after reading your post, it appears probable that Raman might have seen Bailey's articles since he studied western asrology, and there was the British-Indian political link. This doesn't necessarily indicate the origin of the system, but does privide support for a European-Indian exchange of astrological ideas. I have bolded the phrase I left out in my original post.
"...In India, there are two schools of thought bearing on the question of Bhava Sphutas (house-division). According to one view, shared by a vast majority of people not only in India but also in Europe and America, the length of each Bhava will be 30 degrees--the influence extending 15 degrees on either side of the ascending degree (equal house system).
"According to the other view, this system is unscientific because it ignores the relationship between the ecliptic and equator which should be considered for determining the dimensions of the Bhavas. Classical writers like Sripathi favor the determination of Bhavas on the lines given in the following paragraphs. In our humble experience extending for nearly 45 years the equal-house system appears to be yielding more satisfactory results." (page 96)
Thanks Therese that is very useful. It is interesting that E.H. Bailey claims to have been using this middle cusp Equal House system for many years in his articles from 1928. Its an intriguing thought that he may have been influenced B.V. Raman. The British Empire dimension in India certainly made such intellectual cross fertilisation more likely. Moreover, the Theosophical movement had close ties to India too.
However, this may be a case of a quite independent stumbling upon a similar approach. Bailey had clearly studied the astrological text of Sripati, setting out his house system, which he cites in his article. Moreover, E.H. Bailey had previously collaborated with Alan Leo who advocated an Equal House variant with the ASC as the 1st house cusp from the turn of the century. So it wouldn't have been an immense leap for E.H. Bailey to have developed the idea quite independently of B.V. Raman.
The issue remains when did Johannes Vehlow first propose the system that carries his name in the west? Vehlow wrote a piece specifically on this house system in 1931 entitled , Das H?userproblem in der Astrologie (AsBl, 13.Jhg., Hefte 6, 8-9) (The House Problem in Astrology (ASBL, 13.Jhg., Notebooks 6, 8-9)
He also wrote earlier astrological works on the German Republic (1922) and President Paul Von Hindenburg (1925). I dont know if Vehlow was using the middle cusp Equal House system as early as this or not. I have contacted the Vehlow Society in Germany to try to track down his earliest mention of this system.
I haven't seen Vehlow attribute his approach to any Indian sources but that doesn't mean he wasn't influenced by them at least indirectly. There was clearly a lot of interest in Indian astrology in inter-war Germany. For example Wilhelm Wulff , famous for being Himmler's astrologer, wrote a series of works on Indian astrology from 1929 onwards.
I will put in an update here if I find out any more.
Mark