A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 155
ns axis situated? What said of the direction of thespots ? Of their rate of motion ? 318. Of the cause of this irregularity? What variations m^i& forms ofthe solar spots ? Cause ? 819. What other result of the suns revolution about an inclined axis?(Illustrate by diagrams.) OF THE SUN. 151… … March. June. September. December. 1. Let EF represent the plane of the ecliptic. In March, the spots describe a curve,which is convex to the south, as shown at A. In June, they cross the suns disk innearly straight lines, but incline upward. In September, they curve again, though inthe opposite…
Astronomy
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