Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 146
, we will suppose as El. 1. Some astronomers however, have thought that the spots change theirposition on the suns surface. How is the rotation of the sun on its axis ascertained, and the time of the rotation de-termined ? Are the spots supposed to have a motion of their own ? What is their… … PERIOD OF THE SUNS ROTATION. The spot will not therefore reappear when it has arrivedat F, and the sun has made one rotation : the sun mustrevolve still more until the spot has arrived at F, whenit will be seen by the spectator at El on the easternmargin of the sun ; the same place that it occupied…
Astronomy
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