The discussion centers on finding ready-made code for calculating the great circle path between two points on a sphere, specifically using the coordinates phi1, theta1 to phi2, theta2. The key reference is equation (5) from the MathWorld page, which provides a formula for distance but does not directly yield the deltas of phi and theta over a parameter t ranging from 0 to 1. The desired code should be in a C-like programming language to minimize potential bugs. A suggested resource is a Python script from the Basemap toolkit, but the user is open to exploring additional options for code that meets their requirements.
