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
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 … Fig. 240. enough to reach the earth. Sometimes the point of thisshadow falls short of the earths surface, as shown inFig. 239, and sometimes it falls upon the earth, as shownin Fig. 240, according to the varying distance of the sunand moon from the earth. The diameter of the umbra atthe surface of…
Astronomy
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