Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 244
of the sphere andbetween the lines BDS and ACS receives no light at all.If a screen is interposed the shadow is shown quite blackat SS. None of the region to the right of the spherebetween the lines AP and BP is fully illuminated. Someof ihe candle-flame is cut off from every part of this region… … Fig. 140.—The Shadow—Umbra and Penumbra—of a SphereFormed by a Candle. flame (at a point that we may call b). Draw also the lmea A. The point a is illuminated by part of the flame (thepart between b and A) and it receives no light from thepart of the fl me between b and B. It is impossible todraw a…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
