The practical astronomer : comprising illustrations of light and colours, practical descriptions of all kinds of telescopes, the use of the equatorial-transit, circular, and other astronomical instruments, a particular account of the Earl of Rosse's large telescopes, and other topics connected with astronomy (1845)
Dick, Thomas, 1774-1857 · London : Seeley, Burnside, and Seeley · leaf 76
bodyof the sun, though actually intercepted by thecurve of the earths convexity consisting of a densemass of land or water, is actually beheld by thespectator at a. The refractive power of the at-mosphere gradually diminishes from the horizonto the zenith, and increases from the zenith to… … 52 THE PRACTICAL ASTRONOMER. zenith, he would see him where he really is; forhis rays coming perpendicularly through the at-mosphere, would be equally attracted in all direc-tions, and would therefore suffer no inflection. But,about two in the afternoon, he would see the sunat i, though, in…
Astronomy · Astronomical instruments · Telescopes
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