Turner, H. H. (Herbert Hall), 1861-1930 · London, E. Arnold · leaf 190
, nevertheless I will repeat here acomplete series of all my observations of sun-spots, giving not only the number of groups,but also the number of days of observation, andfurther the days when the sun was free fromspots. The number of groups alone will not initself give sufficient accuracy for… … FEB. iS, 1894. M ^■^W ^^Ks* • . • ( ^^^Kiv * \^ g^ ^^Bb^ •««« k ■ im 0^ FEU. 19, 1894. .J X.—Photographs ok the Six taken Ar ihe Roval Observatory Gkke.nwtch, she\vin(; Suxspois, SCHWABE AND THE SUN-SPOT PERIOD 159 in the first case several groups are often countedtogether in one, and in the second…
Astronomy
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