Electro astronomical atlas ... with explanatory notes, questions and answers (1874)
Spoor, J. W. (Joseph W.) · Albany, N.Y., Weed, Parsons and Company · leaf 30
ame direction overthe Suns disc? A. They do not. Sometimes they seem to moveacross it in straight lines ; at others, in curvedlines. Sometimes upward, as they cross fromeast to west; at others, they incline downward. Q. What causes these changes % A. They are owing to the fact that the axis ofthe… … Fig. 5. ELECTRO-ASTRONOMICAL ATLAS. 19 The annexed diagram will still further illus-trate the cause of the change of direction of thesolar spots: V-^ ^^ ^=^/
Astronomy
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