Reference Frames

The chapter Reference Frames first explains the essential differences between coordinate systems, reference systems, and reference frames. All established reference frames such as heliocentric XYZ, terrestrial IJK, orbital reference frames PQW, NTW, and RSW, and mission-specific topocentric frames are presented, including coordinate transformations between them. The representations of angular momentum, eccentricity, radial, and velocity vectors in these different reference frames are provided. Finally, the problem of referencing time is considered.