Olmsted, Denison, 1791-1859. [from old catalog] · New York, R. B. Collins · leaf 86
ould/be seen on the solar disk, would/be less than that occupied inthe remainder of the revolution.Thus, let S, (Fig. 18,) be thesun, E the earth, and abc the pathof the body, revolving aboutthe sun. Unless the spot werenearly or quite in contact withthe body of the sun, being pro-jected upon his… … 106. How are the spots known to be nearly or quite in con-tact with the body of the sun 1 Illustrate by figure 18. Whatcauses the motion of the spots ? What is the period of the sunsrevolution on his axis ? Explain by figure 19. 7 74 THE SUN. the lines which all the solar spots describe on the…
Astronomy
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-198-119.webp)
