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Download e-book for kindle: A Treatise on Astronomy by Sir John Frederick William Herschel

By Sir John Frederick William Herschel

ISBN-10: 0511694326

ISBN-13: 9780511694325

ISBN-10: 1108005543

ISBN-13: 9781108005548

Astronomer and thinker Sir John Herschel (1792-1871), the son of William and the nephew of Caroline, released his 1833 Treatise on Astronomy within the 'Cabinet Cyclopaedia' sequence of which the 1st quantity have been his significantly profitable initial Discourse at the research of traditional Philosophy. he's considered as the founding father of the philosophy of technological know-how, and made contributions in lots of fields together with arithmetic, the newly chanced on strategy of images, and the botany of southern Africa, which he studied whereas making astronomical observations of the southern hemisphere, and the place he was once visited via Darwin and Fitzroy at the Beagle voyage. It was once despite the fact that because the common successor to his father's astronomical stories that he's most sensible remembered, and this publication, that is written for the lay individual, areas powerful emphasis at the significance of exact remark and on heading off preconceptions or hypotheses no longer in response to such remark.

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CHAP. I. GENERAL FORM OP THE EARTH. 15 the sun, moon, and stars can pass; and that side must, at least, be so far like what we see, that it must have a sky and sunshine, and a day when it is night to us, and vice versd ; where, in short, —" redit a nobis Aurora, diemque reducit. " Georg. (19-) As soon as we have familiarized ourselves with the conception of an earth without foundations or fixed supports—existing insulated in space from contact of every thing external, it becomes easy to imagine it in motion — or, rather, difficult to imagine it otherwise; for, since there is nothing to retain it in one place, should any causes of motion exist, or any forces act upon it, it must obey their impulse.

Every point in a spherical surface has, of course, another diametrically opposite to i t ; and as the spectator's horizon divides his sphere into two hemispheres— a superior and inferior—there must of necessity exist a depressed pole to the south, corresponding to the elevated one to the north, and a portion surrounding it, perpetually beneath, as there is another surrounding the north pole, perpetually above it. "—VIRGIL. One pole rides high, one, plunged beneath the main, Seeks the deep night, and Pluto's dusky reign.

It will be worth while to pursue the general notion thus acquired into some of its consequences, by which its consistency with observations of a different kind, and on a larger scale, will be put to the test, and a clear conception be formed of the manner in which the parts of the earth are related to each other, and held together as a whole. ) In the first place, then, every one who has passed a little while at the sea side is aware that objects may be seen perfectly well beyond the offing or visible horizon—but not the whole of them.

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A Treatise on Astronomy by Sir John Frederick William Herschel

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