Great-circle Intersection Finder

Find both antipodal intersections of two oriented great-circle paths on a sphere.

Spherical planning model only: Earth is treated as a perfect sphere with a configurable radius. Results are not suitable for navigation, legal boundaries, surveying, or safety-critical use.

Paths

Path A

Start latitude

Start longitude

Definition

Bearing (° true)

Path B

Start latitude

Start longitude

Definition

Bearing (° true)

Sphere radius

Distance unit

Intersections

Local spherical plot

Plot uses an equirectangular projection; apparent line shapes and distances are distorted near the poles and date line.