carbon dating
earth method
One method that was used by the early Greeks was the Sun Dial.
sounding technique
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Parallax is a method used to find the distances of stars.
PCR technology can be used to this field.
Uniformitarian geologists will use this method to determine which layer of rock formed at which time period of earth's history, and the order of the formation.
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Density
Astronomers use the method of parallax to determine the distance to relatively close stars like Sirius. By measuring the apparent shift in position of the star as the Earth moves around the Sun, astronomers can calculate the star's distance based on trigonometry.
The Bradford method involves a chemical test. It is used by scientists to determine the concentration of proteins in a solution.
Uranium-lead dating is commonly used to determine the age of Earth. This method relies on the radioactive decay of uranium isotopes into lead isotopes over time. By measuring the ratio of uranium to lead in rocks, scientists can estimate the age of Earth.