Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 254
fill the space below B B. In fact, how-ever, the earths atmosphere is most dense at the surface ofthe earth, and gradually diminishes in density to its exteriorboundary. Therefore, if we wish to represent the facts asthey are, we must suppose the atmosphere to be dividedinto a great number of… … 236 ASmONOMT. a single one of these layers. It follows from this that thepath of a ray of light through the atmosphere is not astraight line like A G, but a curve. We may supposethis curve to be represented in Fig. 72, where the num-ber of layers has been taken very small to avoid confusingthe…
Astronomy
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