André Barbault's Cyclic Index and S&P 500 Behavior | Sergey Tarassov

André Barbault's Index of Cyclical Variations or Cyclic Index measures the balance between waxing and waning angular separations among planets, analogous to lunar phases—where increasing (waxing) angles are associated with more optimistic conditions and decreasing (waning) angles with more pessimistic conditions. The same principle is extended across all planetary angles, with heliocentric configurations preferred.

  

Heliocentric Cyclic Index vs. S&P 500.

Statistical analysis indicates that this index accounts for approximately 6.4% of S&P 500 price variation, representing a modest but notable explanatory contribution for a single indicator. Recent periods show that the index has maintained a consistent relationship with market movements. Further refinement, including the use of neural network methods, may enhance its ability to model optimistic and pessimistic market regimes.

Reference:
Sergey Tarassov (June 22, 2026) - Index of Cyclical Variations and S&P 500 Behavior.