This is interesting !
This is interesting! A good question, very good. If we re-phrase the question then we have two issues: 1) Does the zodiac's progression-of-meaning (as developed in the northern latitude cultures) apply to the southern latitudes as well --- OR --- is it reversed? 2) If it applies equally all over the globe, does it mean that cross-cultural contacts and migrations are the reason people have unknowingly propigated it -- OR -- is it invalid and all in our minds?
Let us lay out some discussion points.
1) To me, it would be logical to see it as reversed IF it is indeed based on the local seasonal/growing cycles. Given that astrologers in southern latitudes have not reported any problems with the conventional application of signs, then I would assume that the signs themselves should have an influence and not the growing cycle.
2) If the signs themselves have intrinsic meanings, then how do we account for the different zodiacs, the shift of signs relative to star patterns (the age of Aquarius and all that) and the fact that we in the northern hemisphere have stuck with, and use, the vernal-equinox point as the basis for our tropical zodiac. The tropical zodiac is mathematically calculated and has no relationship to the star patterns -- it is seasonal related.
So, if sign meanings can't be linked to star patterns, then it leaves "seasonal" issues as having intrinisic meaning to our physiology and conditioning. If that is so, then it should be reversed for the southern hemisphere. Since it is not, then there must be another answer! What is it?
I can't answer that right now. What I do know is this. The signs seem to have some validity in birth charts -- it's like we pass through a conditioning period prior to birth, and are born at a time that seems to "fit." We can read this in a birth chart and it appears valid, even if it is a weak influence relative to planets, aspects, angularity and houses. The signs have some validity in "mundane" astrology in terms of imprinting the event, although it again seems weaker than planetary conjunctions with a basis chart or house applications. NOW HERE IS WHERE I GET INTO A LOT OF TROUBLE. I don't believe "signs" have much value in day-to-day transits and progressions as they overlay a natal chart -- only the characteristics of the natal chart signs seem to have any value at all. In my work I seldom use houses, almost never use signs, often don't use aspects and mostly concentrate on planetary combinations, angularity, cycle charts and cycles that relate to a basis/natal chart.
So, I'll think about your question. If I have found "signs" to be mostly useless to me, then perhaps its because they are weak in influence and in application -- I mean rigorous application where there meanings can be found from chart to chart with very high consistancy. My only advice for you to consider is to just forget about them except in birth charts, and even then, concentrate on aspect patterns and house meanings. Dave.