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Some Refraction Measurements at Low Altitudes
Published online by Cambridge University Press: 18 January 2010
Extract
It may be interesting to report some measurements of refraction which Professor A. N. Black and I made this winter. These were made on the setting Sun, and as the altitude of the observing station was 480.0 ft. it was possible to carry the observations down to the horizontal and, in fact, under clear conditions, to −20′.
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