Dating on earth
The physicist Hermann von Helmholtz (in 1856) and astronomer Simon Newcomb (in 1892) contributed their own calculations of 22 and 18 million years respectively to the debate: they independently calculated the amount of time it would take for the Sun to condense down to its current diameter and brightness from the nebula of gas and dust from which it was born.
Their values were consistent with Thomson's calculations.
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material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.
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In a lecture in 1869, Darwin's great advocate, Thomas H.