Earth Orbit Within the Thermodynamic Model A conditional pressure formulation and geometric assessment of five candidate black hole directions

I formulate a possible pressure account of Earth’s orbit within the Thermodynamic Model. The proposal treats solar output as the principal outward influence and incoming or redistributed thermon momentum as an opposing influence. Five previously selected astronomical directions are retained separately: Gaia BH1, Gaia BH2, Gaia BH3, A0620-00 and OGLE-2011-BLG-0462. Their sky geometry is calculated for approximate perihelion and aphelion configurations, and the complete reference ellipse is drawn without exaggerating its eccentricity. The approximately 5 million km perihelion-to-aphelion distance range is 3.34% of the 149.6 million km midpoint; this differs from the approximately 0.014% flattening of the ellipse. A pressure-only relative-acceleration framework is specified using inertial response and momentum transfer. A conditional inward inverse-square net field yields an ellipse, but that field is an added closure assumption, not a demonstrated consequence of the five sources. Fixed far-source directions alone cannot provide inward curvature throughout a Sun-centred orbit. The contribution is a reproducible geometry calculation, a conditional dynamical formulation and a programme of independent tests. No thermon flux is measured, no orbital observations are fitted, and no empirical replacement for the planetary ephemerides is claimed.