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 98
hile passing from b to c, and beinginvisible while describing the arc cab,it w^ould of course be out of sight lon-ger, than in sight, whereas the two pe-riods are found to be equal. Moreover,the lines which all the solar spots de-scribe on the disk of the sun, are foundto be parallel to each other,… … But although the spots occupy about 27J- days in passing fiom 10 74 THE SUN. one limb of the sun around to the same limb again, yet this is not the period of the suns revolution on his axis, but exceeds it by nearly two days. For, let AAB (Fig. 29,) represent the sun, and EEM the orbit of the…
Astronomy
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