Page:Benton 1959 The Clock Problem (Clock Paradox) in Relativity.djvu/50

 irregularity of the earth's rotation. The agreement is very close but the caesium values show more detail.

A general discussion of the meaning of motion is undertaken. A distinction is made between the kinematic description of motion, in which forces are distinct from the space-structure, and the dynamical, in which forces play no part, but alterations in space-structure control the motions of bodies.

According to time-lengthening theories in Einstein's general theory of relativity, a clock in an earth satellite would run more slowly than one at relative rest on earth. The writer of this article says the difference in a year could be measured with available equipment.

The clock problem is discussed on p.7, 16, 118, 122 and 189.

Chapter I is entitled. The space-time continuum and the separation between events.

On page 89 there is a discussion of a journey to the nearest star and back in just over seventeen years by terrestrial clocks. The author states that owing to "the relativistic contraction of time: the travelers would have "aged" by only 14 1/2 years and adds the following footnote: "The bearing of the relativistic contraction of time on this problem has been questioned, since it leads to an apparent paradox, but the best opinion is that the contraction would occur and that the returning astronaut would, in fact, find that time has gone more rapidly on the earth than in his space ship."

Quotes statements of Herbert Dingle and W.H. McCrea which have appeared in recent issues of Nature in connection with the controversy over motion causing space and time to contract.