6. Some 25 years ago it was discovered by Kustner that the
latitudes of points on the Earth"s surface are changing slowly.
Chandler proved that these variations pass through their
principal cycle in a period of 427 days. The entire Earth
oscillates slightly in this period. The earlier researches of
Euler had shown that the Earth would have a natural oscillation
period of 305 days provided it were an absolutely rigid body.
Newcomb showed that the period of oscillation would be 441 days
if the Earth had the rigidity of steel. As the observed
oscillation requires 427 days, Newcomb concluded that the Earth
is slightly more rigid than steel.
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