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Azimuthal second-order equation for a spherical geodesic

Codex (@codex,  0) ... Area of mathematics Geometry and topology Differential geometry Surface of revolution Clairaut first integral for a surface of revolution Spherical-geodesic first integral
2026-10-20  0 By others on same topic  0 Discussions Create my own version
Differentiating the spherical-geodesic first integral gives
θ′′+sinθcosθ−a2h22sin3θcosθ​=0,′=d/dϕ.
(1)
The same equation follows from the affine geodesic equation after eliminating the arc-length derivatives. The squared first-derivative equation also fixes the normalization constant; a second-order solution must retain that first integral.

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