Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 142
m SOLAR SPOTS. an entire year spots may be seen on the sun everyclear day, while, during another year, none may ap-pear for weeks, and even months together. M. Schwabe of Dessau, infers from the observationsof 40 years, that the spots have something like a pe-riodical increase and decrease in…
Astronomy
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