21. The rotation axis is obviously orthogonal to this plane, and passes through the center "'C "'of the sphere. 22. Thus the " three " in triplet can be identified with the three rotation axis of physical space. 23. Their model does not attempt to explain what caused Mars's rotation axis to move relative to the crust. 24. The monoclinic system includes crystal classes with a single twofold rotation axis and / or a mirror plane. 25. The third quantum number, " K " is associated with rotation about the principal rotation axis of the molecule. 26. The orange axis was the Earth's rotation axis 5, 000 years ago, when it pointed to the star Thuban. 27. The simplest boundary is that of a tilt boundary where the rotation axis is parallel to the boundary plane. 28. This means that mass moves closer to the rotation axis of Earth, and that Earths moment of inertia decreases. 29. All the points of the body change their position during a rotation except for those lying on the rotation axis . 30. It is conventional to set the Cartesian " z " axis of the molecule to contain the principal rotation axis .
