A Falsifiable Triune Harmonic Dynamics Hypothesis for Nested Cosmic and Earth-System Cycles
Kevin L Brown
August 2026
This paper proposes Galactic–Solar–Planetary Harmonic Coupling (GSPHC), a falsifiable Triune Harmonic Dynamics (THD) hypothesis for testing whether multimillion-year Earth-system cycles are embedded within the Solar System’s larger motion through the Milky Way.
The starting point is an unresolved scientific pattern. Recurring multimillion-year structure has been reported across extinction, volcanism, sea level, climate, ocean chemistry, geomagnetism, tectonics, and other geological records. Previous work has identified a candidate planetary base period near 27 million years, with shorter components near 13.5 and 9 million years. The present paper asks whether that planetary-scale structure may itself be part of a larger nested dynamical hierarchy extending from the Galaxy to the Solar System to Earth.
The principal comparison is the Nemesis hypothesis, which proposed that a distant Solar companion periodically disturbed the Oort Cloud, increasing comet showers and extinction risk. Nemesis was scientifically important because it introduced an external astronomical clock, but it remains observationally unconfirmed, is challenged by expected orbital drift, and primarily emphasizes an impact-centered pathway.
GSPHC replaces the requirement for an unseen companion with three independently modeled components of Solar Galactic motion: vertical oscillation relative to the Galactic disk, radial epicyclic motion, and azimuthal orbit around the Galactic center. Published estimates place these periods near 87.8 ± 10.6, 163.2 ± 16.7, and 224.2 ± 22.3 million years, respectively.
If the independently proposed planetary fundamental is provisionally taken as approximately 27 million years, THD motivates examination of the higher-scale sequence 3P, 6P, and 9P, corresponding to approximately 81, 162, and 243 million years. Each lies within the published uncertainty interval of the corresponding Galactic-motion estimate. This numerical agreement is retrospective and is not presented as confirmation.
The falsifiable claim is stronger: the vertical, radial, and azimuthal Galactic phases should form a coupled higher-order timing architecture that is transformed through Solar-System boundary conditions and expressed probabilistically by an internally oscillatory Earth system. The model predicts that a constrained 3:6:9 cross-scale ratio and phase relationship should outperform alternative integer mappings, a Nemesis-like single-period model, a simple Galactic-plane-crossing model, and Earth-only models on held-out geological data.
Possible Solar-System transmission pathways include Galactic tides, Oort Cloud perturbation, molecular-cloud encounters, changes in the interstellar medium, heliosphere restructuring, cosmic-ray variation, and related boundary-condition changes. The paper does not assume that any one pathway is dominant.
The hypothesis is falsified if the proposed 3:6:9 ratio fails under updated Galactic parameters, if alternative mappings fit equally well or better, if cross-scale phase relationships do not predict Earth-system transitions beyond null models, or if internal-Earth or Nemesis-like models perform better.
If supported, the model would not establish that the Milky Way directly causes extinction, volcanism, or climate change. It would instead suggest that Earth’s deep-time rhythms are partly conditioned by larger-scale dynamical states, with the Solar System acting as an intermediate filter and Earth responding according to its internal susceptibility. The hypothesis therefore extends THD from a descriptive planetary pattern into a specific, testable Galaxy → Solar System → Earth coupling model.