The spin axis a body's equator (and rings) is built from, as a unit
reference-frame vector: its pole when set; otherwise axialTiltDeg
tilted toward −y — the equator then has its ascending node on +x and an
inclination of the tilt, exactly the plane an orbit with
inclinationDeg = tilt and longitudeOfAscendingNodeDeg 0 lies in;
otherwise straight up (+z).
The spin axis a body's equator (and rings) is built from, as a unit reference-frame vector: its
polewhen set; otherwiseaxialTiltDegtilted toward −y — the equator then has its ascending node on +x and an inclination of the tilt, exactly the plane an orbit withinclinationDeg= tilt andlongitudeOfAscendingNodeDeg0 lies in; otherwise straight up (+z).