GUINNESS WORLD RECORDS

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IN OCTOBER 1971, FOUR CESIUM ATOMIC CLOCKS WERE FLOWN AROUND THE WORLD AFTER BEING SYNCHRONIZED WITH REFERENCE CLOCKS AT THE U.S. NAVAL OBSERVATORY, WASHINGTON, D.C., U.S.A., IN ORDER TO MEASURE THE EFFECTS PREDICTED BY EINSTEIN'S THEORY OF SPECIAL RELATIVITY. WHEN FLOWN WESTWARD THE CLOCKS GAINED 273 +/-7 NANOSECONDS. WHEN FLOWN EASTWARD THE CLOCKS GAINED 59 +/-10 NANOSECONDS. THE DIFFERENCE BETWEEN THE TWO OWING TO THE EARTH'S ROTATION.

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