Earth: Day Zero • Paper 041 of 512

Great Circle Reconstruction I

The Earth: Day Zero framework evaluates candidate domains on a spherical planet. Therefore, large-scale spatial relationships must be assessed using great-circle geometry rather than planar projection.

A great circle provides the shortest path between two points on a sphere and establishes the natural geometric basis for evaluating entrance-domain, exit-domain, and midpoint-domain relationships.

Purpose

The purpose of the great-circle framework is to determine whether candidate domains form a coherent spherical relationship.

If the proposed entrance and exit domains cannot be connected by a meaningful great-circle structure, the geometric framework weakens.

Domain-Based Approach

Because geological structures occupy regions rather than exact points, the framework evaluates great-circle relationships between domain centroids, boundaries, and uncertainty regions.

This avoids premature precision while still allowing geometric testing.

Initial Constraint

The first great-circle constraint asks whether the candidate Antarctic entrance domain and candidate Arctic exit domain occupy a plausible linked relationship on the sphere.

Subsequent papers introduce midpoint testing, reconstruction uncertainty, and falsifiability criteria.