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 126
compute the distance of the chord A C or C Efrom the arc. This will be found to be about 750,000 miles; but as themoons distance from the earth is only 240,000 miles, its orbit can never bebeyond the chord, but must, as at C D E, be within it; and hence, must bealways concave to the sun. In the… … 121 the relative distance of the moon being greatly exaggerated, as well as theorbital movement of the earth during the lunation. The arc A C E in thediagram is more than 120°, whereas it should be only about 29°. c. Librations of the Moon.—As the orbit of the moon is elliptical,her velocity is not…
Astronomy
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