What's the best way to make a circular or spiral gradient with css or SVG?

Question

Firstly I Do NOT want a radial gradient (unless it can help me achieve my goal)

I want a circle. The gradient will go from green to blue. The gradient will go clockwise around the circle (not a radial gradient, better described as a spiral gradient or a clockwise gradient). What's the best way to achieve this?

The only idea so far is to divide the circle into many segments and to apply a linear gradient to each segment but I'm hoping for a better solution.

The solution must be achieved with SVG graphics and / or HTML CSS.

Thanks in advance.