Everything's relative, or is it? - viXra.org
The angular reference is also the reference frame, with respect to which the attitude is defined: it may then be measured or computed. Gimbaled. Strap-down.
JPL IOM 335.1-11-93 - PDS Geosciences NodeSince simultaneity is relative therefore, a different relativistically moving inertial frame of reference perceives the quantum state collapse ... Mmbd Spdce Fligbt Center, AlabamaWe are going to assume that frame one is an inertial reference frame, i.e., that parcels observed in frame ... mean by an inertial reference frame ... The Geometric Derivation of the Transformation of Time and PositionNow, let us try to extract the relative inertial kinetic energy of a body, moving with zero linear acceleration, constituting an inertial frame of reference ...
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