It was proposed by Robert Pound and his graduate student Glen A. Rebka Jr. in 1959, and was the last of the classical tests of general relativity to be verified (in the same year).
Predložio ga je Robert Pound i njegov student Glen A. Rebka mlađi 1959. godine, i bio je to posljedni od klasičnih ispitivanja relativnosti koji je bio potvrđen i to iste godine.