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 were his significantly winning initial Discourse at the examine of typical 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 means 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 through Darwin and Fitzroy at the Beagle voyage. It was once notwithstanding because the average successor to his father's astronomical reviews that he's top remembered, and this publication, that is written for the lay individual, locations robust emphasis at the significance of exact statement and on averting preconceptions or hypotheses now not in line with such commentary.
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Additional resources for A Treatise on Astronomy
To get sight of this segment, he must travel southwards. In so doing, a new set of phenomena- come forward. In proportion as he advances to the south, some of those constellations which, at his original station, barely grazed the northern horizon, will be observed to sink below it and set; at first remaining hid only for a very short time, but gradually for a longer part of the twentyfour hours. They will continue, however, to circulate about the same point — that is, holding the same invariable position with respect to them in the concave of the heavens among the stars; but this point itself will become gradually depressed with respect to the spectator's horizon.
That this line is really a circle, we conclude, first, from the perfect apparent similarity of all its parts; and, secondly, from the fact of all its parts appearing at the same distance from us, and 16 A TREATISE ON ASTRONOMY. CHAP. I. that, evidently a moderate one;, and, thirdly, from this, that its apparent diameter, measured with an instrument called the dip sector, is the same (except under some singular atmospheric circumstances, which produce a temporary distortion of the outline), in whatever direction the measure is taken, — properties which belong only to the circle among geometrical figures.
56-) A free rotation of the earth round its centre, if it exist and be performed in consonance with the same mechanical laws which obtain in the motions of masses of matter under our immediate control, and within our ordinary experience, must be< such as to satisfy two essential conditions. It must be invariable in its direction with respect to the sphere itself, and uniform in its velocity. The rotation must be performed round an axis or diameter of the sphere, whose poles or extremities, where it meets the surface, correspond always to the same points on the sphere.
A Treatise on Astronomy by Sir John Frederick William Herschel