Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 207
edge of the sun is about twenty-sevendays. 184. The Rotation of the Sun.—The spots are evidentlycarried around by the rotation of the sun on its axis. It isevident, from Fig. 201, that the sun will need to make morethan a complete rotation in order to bring a spot againupon the same part of the… … ASTRONOMY. I87 While the sun is turning on its axis, the earth moves in itsorbit from E to Er: hence the sun must make a completerotation., and turn from a to a in addition, in order tobring the spot again to the centre of the disk. To carrythe spot entirely around, andthen on to ar, requires…
Astronomy
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