Sun (Sol) — Planetary Sphere

The fourth rung — luminous, central among the seven planets.

The Sun sits at the midpoint of the seven planetary spheres, the brightest of the fixed luminous bodies, yet still fully beneath the Stellatum — still spatial, still material, still one sphere among many governed by influence descending from above.

Its influence upon Earth: light and vitality (a traditional attribution).

LLM parallel: Transformer Layer 4

The midpoint layer of the stack: contextual vectors have been meaningfully reshaped by the layers below, but the final answer region is still several transformations away.

Part of an interactive 3D tower of the Ptolemaic cosmos and its mirror in transformer architecture, built as a companion to the essay The Celestial Mirror: How Medieval Cosmology Reveals the Architecture of (Artificial) Intelligence.