Note 2 — APPENDIX I Simple Derivation of the Lorentz Transformation [Supplementary to Section XI]
Robert W. (Robert William) Lawson translation
The displacement of spectral lines towards the red end of the spectrum was definitely established by Adams in 1924, by observations on the dense companion of Sirius, for which the effect is about thirty times greater than for the Sun. R.W.L.—translator ↑