Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 241
of the umbra of the earths shadow: hence,in order to produce an eclipse of the sun, new moon mustoccur somewhere within this prolongation of the umbra of theearths shadow. Now, it is evident that the diameter of this 218 ASTRONOMY. cone is greater on the side of the earth toward the sun thanon the… … Fig. 239. one in the penumbra would see only a partial eclipse. Themagnitude of this partial eclipse would depend upon thedistance of the observer from the umbra of the moonsshadow.The umbra of the moons shadow is just about long
Astronomy
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