- #1
McGravity
- 6
- 0
The Riemann curvature of a unit sphere is sine-squared theta, where theta is the usual azimuthal angle in spherical co-ordinates, and this is shown in many textbooks. But since a sphere is completely specified by its radius, then as far as I can see its curvature should be a function of its radius only and I cannot see how theta is involved or what value it would be given.