Early estimates on the mean density of the Earth were made by observing the slight deflection of a pendulum near a mountain, as in the.
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After a lengthy search over the summer of 1773, Mason reported that the best candidate was , a peak in the central.
Despite the little chance of an accurate estimate of the average density of the Earth in this way, in 1880 realized a gravimetry experiment in Tokyo and at the top of.
The experiment was a failure due to a fire and a flood.
This weight fluctuates depending on gases and dust escaping the atmosphere, as well as other activities in the solar system activities, such as meteors and comets hitting Earth.