By Sir John Frederick William Herschel
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 vastly profitable initial Discourse at the learn of traditional Philosophy. he's considered as the founding father of the philosophy of technology, and made contributions in lots of fields together with arithmetic, the newly found strategy of images, and the botany of southern Africa, which he studied whereas making astronomical observations of the southern hemisphere, and the place he used to be visited by way of Darwin and Fitzroy at the Beagle voyage. It was once notwithstanding because the typical successor to his father's astronomical reviews that he's top remembered, and this ebook, that is written for the lay individual, areas robust emphasis at the significance of actual remark and on warding off preconceptions or hypotheses no longer in accordance with such statement.
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Extra resources for A Treatise on Astronomy
It must, therefore^ be equal to 4x2112 = 8448, or, in round numbers, about 8000 miles, which is not very far from the truth. ) Such is the first rough result of an attempt to ascertain the earth's magnitude; and it will not be amiss if we take advantage of it to compare it with objects we have been accustomed to consider as of vast size, so as to interpose a few steps between it and our ordinary ideas of dimension. We have before likened the inequalities on the earth's surface, arising from mountains, valleys, buildings, &c.
I. apparent proportions, and the likeness is not taxed with incorrectness, though a man in the foreground should be represented larger than a mountain in the distance. So it is to a spectator of the heavenly bodies pictured, projected, or mapped down on that imaginary sphere we call the sky or heaven. Thus, we may easily conceive that the moon, which appears to us as large as the sun, though less bright, may owe that apparent equality to its greater proximity, and may be really much less; while both the moon and sun may only appear larger and brighter than the stars, on account of the remoteness of the latter.
Parently resting on the horizon, its whole disk is in reality below it, and would be entirely out of sight and concealed by the convexity of the earth but for the bending round it, which the rays of light have undergone in their passage through the air, as alluded to in art. 40. ) It follows from this, that one obvious effect of refraction must be to shorten the duration of night and darkness, by actually prolonging the stay of the sun,and moon above the horizon. But even after they are set, the influence of the atmosphere still continues to send us a portion of their light; not, indeed, by direct transmission, but by reflection upon the vapours, and minute solid particles, which float in it, and, perhaps, also on CHAP.
A Treatise on Astronomy by Sir John Frederick William Herschel