A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 81
the disturbances in this atmosphere cause thespots, which are in fact only openings in it filled withclouds of various degrees of density. -—r- ■i -ll A SPOT PASSING ACROSS THE DISK. 106. There is a general movement of the spots acrossthe suns disk from east to west. A particular spot firstappears… … MOVEMENT OF THE SUN AND SPOTS. 105. What hypothesis is advanced to account for them ? 106. How do the spotsappear to move ? What is the time of a complete revolution ? What is inferredfrom this ? £ UN A XD PL A NE TS. 79 From tliis we infer that the sun rotates on its axis in25^ days. 107. A…
Astronomy
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