Corn and Cotton: Long-Term Cycle Projections | Sergey Tarassov

A Timing Solution analysis of Corn and Cotton identifies a ~17.75-year cycle consistent with Edward R. Dewey's work, but also closely aligned with the 18.6-year Lunar Node cycle.

The pink-shaded chart background marks the out-of-sample projection of Corn through 2036.

 

Treated as an external and irregular cycle, projections built using the Lunar Node framework outperform standard spectral projections, highlighting the importance of adhering to method rules and analytical discipline.

The pink-shaded chart background marks the out-of-sample projection of Cotton through 2050.

In monthly Cotton prices, the commonly cited ~17.75-year cycle appears to be variable rather than fixed, evolving from roughly 17.4 years historically to about 19.3 years in recent data—closer to a 19–20 year Metonic-like rhythm. Modeling the cycle as dynamic and incorporating multiple overtones produces a more accurate representation of historical price movements than a simple fixed sine wave.

Reference:
Sergey Tarassov (July 12, 2026) - Corn Cycle Analysis: 17.75-Year Cycle and Lunar Node Influence.

Sergey Tarassov (June 17, 2026) - Variable Long-Term Cycle in Cotton Prices: Wavelet and Harmonic Analysis.