Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 148
sphere, which refracts the rays oflight from the sun which enter it near the points G and H, Fig.57, and turns them into the cone. The rays which pass stillnearer to these points are probably absorbed by the atmosphere,thus giving rise to the observed increase of the shadow mentionedin Art. 153.… … Fig. 59. To an observer situated within the umbra, at any point of thearc ab, the eclipse will be total; while to one situated within thepenumbra, as at L, for instance, the eclipse will be partial.Beyond the penumbra no eclipse whatever will be seen. Hencethe geographical position of the observer…
Astronomy
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