Frame of reference
ABSTRACT COORDINATE SYSTEM AND THE SET OF PHYSICAL REFERENCE POINTS THAT UNIQUELY FIX (LOCATE AND ORIENT) THE COORDINATE SYSTEM AND STANDARDIZE MEASUREMENT(S)
Frames of reference; Reference frames; Frame dependent; Relative reference; System of reference; Fixed coordinate system; Reference Frame; Reference frame (physics); Frame of Reference; Reference system; Observational reference frame; Observational frame of reference; Spacetime coordinates; Reference frame; Reference point (physics); Observer's reference frame
In physics and astronomy, a frame of reference (or reference frame) is an abstract coordinate system whose origin, orientation, and scale are specified by a set of reference points―geometric points whose position is identified both mathematically (with numerical coordinate values) and physically (signaled by conventional markers).