Effect of the 1999 solar eclipse on atomic clocks

Thomas Udem, Jörg Reichert, Ronald Holzwarth, Theodor Hänsch, Rainer Krämer, Jörg Hahn and Jens Hammesfahr
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Thomas Udem: Max-Planck-Institut für Quantenoptik
Jörg Reichert: Max-Planck-Institut für Quantenoptik
Ronald Holzwarth: Max-Planck-Institut für Quantenoptik
Theodor Hänsch: Max-Planck-Institut für Quantenoptik
Rainer Krämer: Deutsches Zentrum für Luft- und Raumfahrt e.V.
Jörg Hahn: Deutsches Zentrum für Luft- und Raumfahrt e.V.
Jens Hammesfahr: Deutsches Zentrum für Luft- und Raumfahrt e.V.

Nature, 1999, vol. 402, issue 6763, 749-750

Abstract: Abstract Solar eclipses have been reported to have a strange influence on the behaviour of atomic clocks1 and pendulums2,3, which has been attributed to some unknown feature of gravity4. Here we correct this idea after being unable to detect any anomalous changes in the relative rates of three types of atomic clock, based on the ground-state hyperfine transitions of hydrogen, rubidium and caesium, during the solar eclipse of 11 August 1999 over central Europe.

Date: 1999
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DOI: 10.1038/45442

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