Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
An eclipse of the moon, or lunar eclipse, is caused by her falling intothe earths shadow. 897. Eclipses are either total, partial, or annular.—AVhenthe disk of the sun or moon is wholly obscured, the eclipse is total;when only partly obscured, the eclipse is partial; when the centralpart of the… … 898. Figure 11.—The direction in-which eclipses come on.—The dotted arrow represents the orbit of the earth ; the other ar-rows, the rotation of the earth on its axis, and the revolution of themoon in its orbit. The sun is seen on the left. U represents theearths umbra, and PP, its penumbra. The…
Physics · Astronomy
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