A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 108
A SPOT PASSING ACBOSS THE DISC. a. A particular spot which can be identified by its appearance firstappears on the eastern limb, or edge, of the disc, passes across to thewestern limb, and then disappears ; but after about two weeks, re-ap-pears on the eastern limb, completing an entire revolution… … MOVEMENT OP THE SXTN AND SPOTS. 27i days. But this must be longer than the period of a rotation,because the earth is moving in its orbit in the same direction. When, Questions.—150. Does the sun rotate? 151. How is this known ? a. How do thespots move ? Their time of rotation ? How to find the time…
Astronomy
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