I Hate Coordinate Systems
Okay, now do space reference frames.<p><a href="https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/Tutorials/pdf/individual_docs/17_frames_and_coordinate_systems.pdf" rel="nofollow">https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/Tutorials/pd...</a><p><a href="https://en.wikipedia.org/wiki/Earth-centered_inertial" rel="nofollow">https://en.wikipedia.org/wiki/Earth-centered_inertial</a>
vs
<a href="https://en.wikipedia.org/wiki/ECEF" rel="nofollow">https://en.wikipedia.org/wiki/ECEF</a>