An interferometer undergoing this process produces
An interferometer undergoing this process produces shifted interference fringes in the Sagnac effect. Although it is not contraction, an object traveling at high velocity appears to undergo this process, the extent of which depends on the angle at which the object is seen; that effect is named for Terrell and Penrose. Reference frames undergoing this process may be described using Born coordinates, as in the (*) Ehrenfest paradox. The angular momentum operator is the generator of these. Symmetry with respect to this operation corresponds to conservation of angular momentum, according to Noether's theorem. Any orientation can be obtained by composing three of these, and they are described by the Euler angles. For 10 points, name this process whose rate is given by angular velocity, the circular movement of an object about a central axis or point.
An interferometer undergoing this process produces shifted interference fringes in the Sagnac effect.