TON is a helioseismology program that aims to understand the relationship between the sun and the earth by measuring oscillations of the solar surface (see "Here Comes the Sun").
以觀測太陽震波瞭解日、地關係的日震計畫（請參閱「陽光男人」一文），十年來在全球裝設了四座光學望遠鏡。