A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1859)
Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 125
the moon was at G-, H, I, or J, in her orbit, when the change occurred, she wouldeclipse the upper or northern limb of the sun, according to her distance from her nodeat the time; but if she was at K, she would pass above the sun, and would not eclipsehim at all. The points C and J will represent… … Penumbra is from the Latin pene, almost, and umbra, a shadow. In this cut, theearths umbra and penumbra will be readily found by the lettering; while A is the um-bra, and BB the penumbra, of the moon. The latter is more broad than it should be,owing to the nearness of the sun in the cut, as it…
Astronomy
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