Abstract
NOT many months ago, a very careful and critical examination by Dr. C. E. St. John of the wave-lengths of the lines in the solar spectrum was sufficient to convince a large body of astronomers that the displacement towards the red of spectrum lines originating in a region of high gravitational potential, required by Einstein's theory of relativity, was an actual phenomenon. An element of doubt remained, however, owing to the exceedingly small amount of the displacement in question and the unknown effects of convection currents and other disturbing influences in the solar atmosphere.
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Relativity Displacement of Spectral Lines and Stellar Constitution. Nature 116, 285 (1925). https://doi.org/10.1038/116285a0
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DOI: https://doi.org/10.1038/116285a0