Electro astronomical atlas ... with explanatory notes, questions and answers (1874)
Spoor, J. W. (Joseph W.) · Albany, N.Y., Weed, Parsons and Company · leaf 32
ecraters, piercing andtearing away success-ively the two interioratmospheres of theSun, would produceholes of the greater orless extent, openingsthrough which thecentral nucleus or theoverlying umbracould be seen. Theseopenings, therefore,should present gen-erally the form of anirregular… … on its axis brings a spot nearer to the center,hence gives us a more direct view of the opening,and we discover more of the dark body. Again,the nucleus will disappear as it passes by the center,until we only can see the side of the opening,and in a short timethe penumbra willalso pass from…
Astronomy
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