André Barbault’s Cyclic Index represents one of the most rigorous attempts to quantify the relationship between planetary movements and the macro-scale tides of human history, particularly regarding the universal concern for war and peace. While the technique was originally designed by the French astrologer Henri-Joseph Gouchon as a way of plotting planetary activity to reflect periods of stability or turbulence, it was Barbault who publicized, refined, and became the recognized leader in the field.
This
concept is rooted in mundane astrology, yet its construction is purely
mathematical, focusing on the five outer planets from Jupiter to Pluto.
Barbault sought to move away from the interpretation of individual
aspects toward a holistic, quantitative measurement of what he termed
planetary concentration or dispersal. He laid out the technical
framework for this model in his 1967 foundational work Les Astres et
l'Histoire, published by Pauvert, and expanded it in his 1979 definitive
textbook L’Astrologie Mondiale.
Barbault’s core hypothesis posits that when the outer planets cluster together in the same region of the sky—a phenomenon driven by multiple concurrent conjunctions—the sum drops significantly, creating a deep trough. These low points reflect conditions of turbulence, intense global tension, and major wars. As the graph ascends, it indicates the planets are moving toward oppositions, leading to peaks. These peaks typically coincide with periods of international stability, economic expansion, and general optimism. The logic is that the concentration of these heavy planetary energies focuses collective human experience into a narrow, pressurized window, leading to the collapse of old orders. However, the index does not make exact predictions; rather, it shows the overall climate of world events and the economy. A recognized weakness in the graph is that it contains no representation for square aspects, which can occasionally trigger outbreaks of conflict even when the index is not at a trough.
See also:

