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Updated: May 3, 2025
Eighteen months later, Zöllner devised his "reversion-spectroscope" for doubling the measurable effects of line-displacements; aided by which ingenious instrument, and following a suggestion of its inventor, Professor H. C. Vogel succeeded at Bothkamp, June 9, 1871, in detecting effects of that nature due to the solar rotation.
He and O. Lohse, at Bothkamp, November 3 to 11, 1871, saw the dark hemisphere partially illuminated by secondary light, extending 30° from the terminator, and thought the effect might be produced by a very extensive twilight.
Some of them had been clearly perceived by De Ball at Bothkamp in 1882. Mr. Lowell followed Schiaparelli's example by observing Mercury in the full glare of noon.
Others have had recourse to the analogy of our auroræ, and J. Lamp suggested that the grayish gleam, visible to him at Bothkamp, October 21 and 26, 1887, might be an accompaniment of electrical processes connected with the planet's meteorology.
Thus, observations irreconcilable with a swift rate of rotation were made at Bothkamp in 1871 by Vogel and Lohse; and a drawing executed by Professor Holden with the great Washington reflector, December 15, 1877, showed the same markings in the positions recorded at Milan to have been occupied by them eight hours previously.
In 1870, Mr. Ranyard whose death, December 14, 1894, was a serious loss to astronomy acting upon an earlier suggestion of Sir William Huggins, collected records of unusual appearances on the disc of Jupiter, with a view to investigate the question of their recurrence at regular intervals. He concluded that the development of the deeper tinges of colour, and of the equatorial "port-hole" markings girdling the globe in regular alternations of bright and dusky, agreed, so far as could be ascertained, with epochs of sun-spot maximum. The further inquiries of Dr. Lohse at Bothkamp in 1873 went to strengthen the coincidence, which had been anticipated
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