List, C, Hall, T. G. (Thomas Grainger), 1803-1881 · Philadelphia : Thomas Cowperthwait & Co. and Carey & Hart · leaf 47
r edges, and to be placed flatways to aneye looking from the bottom of the paper to thetop; then the edges of these circles at w and swill pass through the sun, and their flat sides at vand a will be turned towards him. At w, which is our winter, we see that n, thenorth pole, is turned from the… … %,T^ Suppose the above figure to represent the earth,N its north pole, s the south pole, e q, the equator,and o the sun. Now, since one-half the globe is always illumi-nated by the rays of the sun, let l d separate thedark part from the region of light; then, in thisposition of the earth, the north…
Astronomy
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