A real km vector — x/y in the system's reference plane, z out of it
(orbital convention, before render.ts remaps it into three.js's Y-up
world). Lives here, with the rest of the data contract; still
re-exported from kepler.ts, where it used to be declared.
A real km vector — x/y in the system's reference plane, z out of it (orbital convention, before render.ts remaps it into three.js's Y-up world). Lives here, with the rest of the data contract; still re-exported from kepler.ts, where it used to be declared.