A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 119
the umbra, there is formed on eachside a space from which the light is only partially excluded ; thisis called the penumbra. The relations of the umbra to the penum-bra will be understood by inspecting the annexed diagram. 182. If the moon moved exactly in the plane of theearths orbit, a solar… … AVhen the moon is new or full at a considerable distance fromits node, it is too far above or too far below the plane of the eclip-tic to intercept the suns rays from the earth, or to pass within thelimits of the earths shadow. It will be easily understood that noeclipse can occur unless the sun,…
Astronomy
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