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 175
ving been employedby the old astronomers, and more particularly by Kepler in those,investigations which resulted in the discovery of his third law. Thefollowing is a brief statement of this method:— Let S (Fig. 102), represent the sun, E e the daily arc of movement of theearth, and M m, that of… … angle E S e, since it is the amount of angular movement of the earthfor the time; hence, the third angle oeS becomes known; and the ratio ofo S to e S, since this is equal to the ratio of the sines of o e S and e 08. Inthe triangle o m S we have, in the same manner, the angles o and mSM,the latter…
Astronomy
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