List, C, Hall, T. G. (Thomas Grainger), 1803-1881 · Philadelphia : Thomas Cowperthwait & Co. and Carey & Hart · leaf 46
sPlace a lamp so that its wick may be of the sameneight as the equator, at a considerable distance THE SEASONS. 41 from the globe ; then, as the globe is turned round,the illuminated parts will be those which are aboutthe equator, while the poles and a considerablepart of the globe in their… … time we shall be enabled to show the difference ofthe lengths of days in the different periods of theyear. Let o be the sun, w v s a the orbit or path ofthe earth, v and a being the vernal and autumnalequinoxes; s and w the summer and winter sol-stices ; n s the axis of the earth; n being thenorth…
Astronomy
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