Nucleocosmochronology has been employed to determine the age of the Sun (4.57 ± 0.02 billion years) and of the Galactic thin disk (8.8 ± 1.8 billion years), among others. It has also been used to estimate the age of the Milky Way itself by studying Cayrel's Star in the Galactic halo, which due to its low metallicity, is believed to have formed early in the history of the Galaxy.