Abstract
RECENT observations by Sadeh, Knowles and Yaplee1 of the 21 cm absorption line from Taurus A have shown that there is a decrease of frequency (unaccounted for by general relativity) when the optical path approaches the Sun. They also found a decrease of frequency2, roughly proportional to the distance, when a terrestrial source (caesium clock) was used.
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References
Sadeh, D., Knowles, S. H., and Yaplee, B. S., Science, 159, 307 (1968).
Sadeh, D., Knowles, S. H., and Au, B., Science, 161, 567 (1968).
Szekeres, G., J. Math. Mech., 6, 471 (1957).
Szekeres, G., J. Math. Mech., 6, 508 (1957).
Schapiro, I. I., Phys. Rev. Lett., 20, 1265 (1968).
Fürth, R., Phys. Lett., 13, 221 (1964).
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SZEKERES, G. Effect of Gravitation on Frequency. Nature 220, 1116–1118 (1968). https://doi.org/10.1038/2201116a0
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DOI: https://doi.org/10.1038/2201116a0
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