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Index/Topics/Great-Circle Geometry

Great-Circle Geometry

The geometry of the shortest path on a sphere, often used to explain the routes of long-haul flights.

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Jan 11, 2026
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How would a flat-Earth model account for global airline flight routes and time zone synchronization?

Flat‑Earth proponents try to reconcile long‑haul flight routes and time zones by invoking alternate map geometries, selective route examples, and ad hoc explanations about navigation and the Sun’s beh...

Jan 30, 2026

How do nautical almanacs and celestial navigation tables mathematically rely on a spherical Earth?

Nautical almanacs and tables embed a at every step: they give the geographic position (GP) of celestial bodies in latitude and longitude, build sight-reduction tables and position circles from those G...