Among the experiments included in U.S. space program for 1959 is that involving a further test of Einstein's general theory of relativity. This would be done by comparing the time kept by an atomic clock in an earth-circling satellite with a similar clock at a ground station during a month or more.
Letters to the editor from Halsbury; Herbert Dingle; Bennett Weston; E. Hogben; R. A. Fisher, relative to the controversy between Dingle and McCrea, and W. H. McCrea's reply to these letters.
Demonstrates that two bodies cannot approach each other faster than the velocity of light.
A review of opinions and arguments concerning time dilatation.
Effect of relative motion on length of time, p.3-6; time effects, p.67.
The clock paradox, p.42-44.
In French.
Translated title: The atomic clock and the irregularity of the rotation of the earth.
The variations in the rotation of the earth as determined from observations with the caesium frequency standard constructed by Essen at the NPL are compared with the extrapolated values used at the Bureau International de l'Heure to allow for the seasonal
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