about an axis
61Parallel axis theorem — In physics, the parallel axis theorem can be used to determine the moment of inertia of a rigid body about any axis, given the moment of inertia of the object about the parallel axis through the object s center of mass and the perpendicular… …
62rotation axis — noun : a simple axis of symmetry in a crystal about which the whole crystal configuration is brought into coincidence with its original aspect by a rotation of one half, one third, one fourth, or one sixth of a turn about the axis * * * Crystall …
63rotation-inversion axis — /roh tay sheuhn in verr zheuhn, sheuhn/, Crystall. an axis of a crystal such that rotating about the axis and then inverting the crystal brings the crystal back to its original position. Also called symmetry axis of rotary inversion. Cf. symmetry …
64rotation-inversion axis — /roh tay sheuhn in verr zheuhn, sheuhn/, Crystall. an axis of a crystal such that rotating about the axis and then inverting the crystal brings the crystal back to its original position. Also called symmetry axis of rotary inversion. Cf. symmetry …
65normal axis — A straight line through the center of gravity, which is vertical when the airplane is in the rigging position. The aircraft yaws about this axis. Also called a vertical axis …
66screw axis — Crystall. a symmetry element of a space group such that a rotation of the lattice about the axis and a translation of the lattice some fraction of the lattice s unit distance brings the lattice back to its original position. [1900 05] * * * …
67longitudinal axis — A straight line running fore and aft through the center of gravity. It is horizontal when the airplane is in the rigging position. The aircraft rolls about this axis. See axes. Pilot’s personal logbook …
68One-Axis Tracking — A system capable of rotating about one axis …
69one-axis tracking — A system capable of rotating about one axis. Solar Electric Glossary …
70screw axis — Crystall. a symmetry element of a space group such that a rotation of the lattice about the axis and a translation of the lattice some fraction of the lattice s unit distance brings the lattice back to its original position. [1900 05] …
