Guy's Elements of astronomy : and an abridgment of Keith's New treastise on the use of the globes (1864)
Guy, Joseph, 1784-1867, Keith, Thomas, 1759-1824. A new treatise on the use of the globes · Philadelphia, C. Desilver · leaf 100
iles it will not refract the rays of light from the sun. The suns rays falling upon the higher parts of it be-fore rising, causes by reflection a faint light, which in-creases till he appears above the horizon; and in theevening decreases after he sets, till he s eighteen de-grees below the… … Fi(^. Sci r^- jBW/. /^la. />: P. S Sjir^ ^.itU REFRACTION. 63 CHAPTER XXII. REFRACTION. The rays of light, in passing out of one medium intoanother of a different density, deviate from a rectilinealcourse ; and if the density of this latter medium con-tinually increase, the rays of light, in…
Astronomy
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