Abstract
Spectroscopic measures on the rotation of Venus were made by V. M. Slipher in 1903 at the Lowell Observatory,1 and by St. John and Nicholson at the Mount Wilson Observatory about 1923. 2 These early observations were confined to the blue and violet spectral regions, using an iron arc comparison spectrum to correct for the inclination of the spectrum lines. It seemed desirable to repeat the work with the fast emulsions now available in the red, using telluric lines in the A 6300 region for comparison, so that solar absorption lines might be measured against atmospheric absorption lines. The eastern elongation of Venus in the spring of 1956 offered a favorable opportunity to launch such a program. It was decided to take the spectrograms with the Snow telescope on Mount Wilson, which, although designed for solar work, had the advantage of being available on any evening. Additional spectra were photographed in October 1956, when Venus was west of the sun, at the coude focus of the 100-inch telescope.
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