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was published, the earth was "scientifically" determined to be 100 million years old. In 1947, science firmly established that the earth was 3.4 billion years old.
As one answer to his critics, Kelvin produced a completely independent estimate -- this time for the age of the Sun.
Based on these assumptions he at first suggested an age of the Earth of between 100 Ma and 500 Ma.
Other factors and basic assumptions must also be considered.
Of course, Kelvin formed his estimates of the age of the Sun without the knowledge of fusion as the true energy source of the Sun.
He believed this even though he did admit that some heat might be generated by the tidal forces or by chemical action.