An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 99
axis. But during the 27i days in which the spot has been performing its apparent revolution, the earth has been advancing in his orbit from E to E, where the visble disk of the sun is AB. Consequently, before the spot can appear again on the limb from which it set out, it must describe so much more… … 149. If the path which the spots appear to describe by the re-volution of the sun on his axis left each a visible trace on his sur-face, they would form, like the circles of diurnal revolution on theearth, so many parallel rings, of which that which passed throughthe center would constitute the…
Astronomy
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