Who was the first to estimate the weight of the Earth?

The Earth has been weighed by several scientists.
Its weight was first found by experiment in 1797-98 by an Englishman Henry Cavendish (picture) who estimated that our globe weighs about five and a half times as much as an equal bulk of water, its weight being 12,500,000,000,000,000,000,000,000 pounds (5.66990463 x 10^24). His estimate agrees very closely with the calculations of later experimenters.
More reading:
Earth (Wikipedia)
Henry Cavendish (Wikipedia)

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