A Treatise on Astronomy by Sir John Frederick William Herschel PDF

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 were his drastically winning initial Discourse at the learn of usual 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 found technique 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 by means of Darwin and Fitzroy at the Beagle voyage. It was once despite the fact that because the usual successor to his father's astronomical stories that he's top remembered, and this publication, that is written for the lay individual, locations robust emphasis at the significance of actual commentary and on keeping off preconceptions or hypotheses no longer in keeping with such remark.

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SIZE OF THE EARTH. 21 between them, and if we suppose a D b to be the sphere of the earth, and C its centre in the figure C D b B, we know D b, the length of the arch of the circle between D and b, — viz. half the measured interval, and b B, the excess of its secant above its radius —which is the height of B,— data which, by the solution of an easy geometrical problem, enable us to find the length of the radius D C. If, as is really the ca^e, we suppose both the heights and distance of the stations inconsiderable in comparison with the size of the earth, the solution alluded to is contained in the following proposition : — The earth's diameter bears the same proportion to the distance of the visible horizon from the eye as that distance does to the height of the eye above the sea level.

Such changes, however, are inconsistent with the idea of a rotation of a body of regular figure about its axis of symmetry, performed in free space, and without resistance or obstruction from any surrounding medium. The complete absence of such obstructions draws with it, of necessity, the strict fulfilment of the two conditions above mentioned. (57-) Now, these conditions are in perfect accordance with what we observe, and what recorded observation teaches us, in respect of the diurnal motions of the heavenly bodies.

I. SIZE OF THE EARTH. 21 between them, and if we suppose a D b to be the sphere of the earth, and C its centre in the figure C D b B, we know D b, the length of the arch of the circle between D and b, — viz. half the measured interval, and b B, the excess of its secant above its radius —which is the height of B,— data which, by the solution of an easy geometrical problem, enable us to find the length of the radius D C. If, as is really the ca^e, we suppose both the heights and distance of the stations inconsiderable in comparison with the size of the earth, the solution alluded to is contained in the following proposition : — The earth's diameter bears the same proportion to the distance of the visible horizon from the eye as that distance does to the height of the eye above the sea level.

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A Treatise on Astronomy by Sir John Frederick William Herschel


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