Grandest century in the world's history; containing a full and graphic account of the marvelous achievements of one hundred years, including great battles and conquests; the rise and fall of nations; wonderful growth and progress of the United States ..etc., etc . rth fromthe sun ; a distance which constitutesthe fundamental unit of measure of thesolar system and generally of all astro-nomical distances. The numerous andexpensive expeditions into different re-gions of the world for the observationof the transit of Venus in the years 1874and 1882 were not so successful as wehad the right to hop
Grandest century in the world's history; containing a full and graphic account of the marvelous achievements of one hundred years, including great battles and conquests; the rise and fall of nations; wonderful growth and progress of the United States ..etc., etc . rth fromthe sun ; a distance which constitutesthe fundamental unit of measure of thesolar system and generally of all astro-nomical distances. The numerous andexpensive expeditions into different re-gions of the world for the observationof the transit of Venus in the years 1874and 1882 were not so successful as wehad the right to hope. It is neverthe-less certain that even on this subjectprogress has been made by the applica-tion of other methods, and especially bymeans of the parallax of some of thesmaller planets. To the twentieth cen-tury will be reserved the attaining of agreater degree of precision, and this is!nade possible by the discovery of theVnall planet Eros, which is nearer to^^e earth than any other planet known. The theories of planetary movements,according to the principles of universalgravitation, have made great progress,and the tables of these movements havebeen brought to a very high degree ofprecision. The theory of gravitationhas been sufficient to account for aP. REMARKABI^E CORONA. observed movements, with the excep-tion of those of Mercury, which stillshows some variations, the cause ofwhich is not known. A great and cele-brated triumph of that theory was thediscovery of the planet Neptune, by theuse of the telescope upon indicationsgiven by the perturbations exercised bythis planet upon Uranus. Another important addition to theastronomical knowledge of the nine-teenth century has been the discoveryof the so-called asteroids which circu-late between the orbits of Mars andJupiter. The number of these nowknown is a little less than five hundred^and its is probable that a great manymore will be discovered in the twentiethcentury. PART VI. RELIGION, LITERATURE AND ART IN THE NINETEENTH
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