A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 124
f 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 umhra, 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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