A proper frame, or comoving frame, is a frame of reference that is attached to an object. The object in this frame is stationary within the frame, which...

called a co-moving frame Proper (heraldry), in heraldry, means depicted in natural colors Proper Records, a UK record label Proper (album), an album by...

A proper reference frame in the theory of relativity is a particular form of accelerated reference frame, that is, a reference frame in which an accelerated...

unidirectional motion, proper acceleration is the rate of change of proper velocity with respect to coordinate time. In an inertial frame in which the object...

is measured to be shorter than its proper length, which is the length as measured in the object's own rest frame. It is also known as Lorentz contraction...

Proper length or rest length is the length of an object in the object's rest frame. The measurement of lengths is more complicated in the theory of relativity...

the rest length or proper length of an object is its length measured in the object's rest frame. (This length corresponds to the proper distance between...

proper time (from Latin, meaning own time) along a timelike world line is defined as the time as measured by a clock following that line. The proper time...

The P/F bit is generally used when either end becomes unsure about proper frame sequencing because of a possible missing acknowledgment, and it is necessary...

comoving frame. Proper distance is also equal to the locally measured distance in the comoving frame for nearby objects. To measure the proper distance...