- The mass of the Earth was first measured with any accuracy (within about 20% of the correct value) in the Schiehallion experiment in the 1770s, and within 1% of the modern value in the Cavendish experiment of 1798.
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How was the size of Earth first measured?
How is the mass of the Earth measured indirectly?
How did Henry Cavendish determine the mass of the Earth?
What is the Earth mass?
The mass of the Earth was first measured with any accuracy (within about 20% of the correct value) in the Schiehallion experiment in the 1770s, and within 1% of the modern value in the Cavendish experiment of 1798. Contents 1 Unit of mass in astronomy 2 Composition 3 History of measurement 3.1 Early estimates 3.2 Schiehallion experiment
How was the size of Earth first measured? Earth's circumference was first accurately measured more than 2,000 years ago by the Greek astronomer Eratosthenes, who at the time lived in the Egyptian city of Alexandria.
In 1798 Cavendish measured the force between attracting lead spheres with a torsion balance. He knew the masses of the spheres and how far apart they were. He carefully measured the force between them, which allowed him to calculate G. G is incredibly small, 0.0000000000667310 Nm2/kg2. (G is known only to the six decimal places.)
Before Henry Cavendish directly measured the value of the gravitational constant G in 1798, enabling a determination of the earth's mass from the acceleration of gravity g, there were other experimenters who calculated the weight of our planet indirectly.
Earth is suddenly spinning faster than usual, but why?
Microsoft and partners may be compensated if you purchase something through recommended links in this article. Some experts believe the melting and refreezing of ice caps could be contributing to the irregular speed, according to the New York Post.
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Answer (1 of 3): What Newton discovered was that for any gravitationally attracting body of mass M, if you knew the acceleration a due to gravity at distance r from the center of M you could obtain GM as ar².