3.16.3.1. Radau integration

Radau integration differs from normal Gauss integration only in that one of the interval end points is always included. Here, the integration is performed over \(\mu =\) the cosine of the inclination relative to the normal, and the point \(\mu=1\) is always included.

This has the advantage that no \(\phi\)-integration (integration over azimuth) is needed for that inclination, which also generally carries the largest specific radiation intensity.