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In 1873 Vogel[7] compared the spectra
of the sun’s East (approaching) limb and
West (receding) limb, and the displacement
of lines endorsed the theory. This last ob-
˜
servation was suggested by ZAllner.
FOOTNOTES:
[1] In the Encyclopaedia Britannica ,
article ”Telescope,” and in Grant’s Physical
Astronomy , good reasons are given for award-
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