Turner, H. H. (Herbert Hall), 1861-1930 · London, E. Arnold · leaf 196
FEB. 20, 1894. … FEi; 1894. XL—Photographs of thic Sex taken at ihk R()Y.\i. Ohser\atory, Greenwich, shewing SunsiOis SCHWABE AND THE SUN-SPOT PERIOD 163 near a spot, we will look at a series of picturesof the whole sun taken on successive days atGreenwich in which the spots are necessarily muchsmaller, but which…
Astronomy
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