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Updated: September 22, 2025
But in 1877 an event took place so interesting in astronomical history, that we have to look back to the memorable discovery of Uranus in 1781 before we can find a parallel to it in importance. Mars had always been looked upon as one of the moonless planets, though grounds were not wanting for the surmise that probably moons to Mars really existed.
So marvellous shall be the victories of science, that the perturbations of the planets in their courses shall reveal the existence of a new one more distant than Uranus, and Leverrier shall tell at what part of the heavens that star shall first be seen.
The sixth book is devoted to the theory of the planetary movements; the seventh, to the lunar theory; the eighth, to the theory of the satellites of Jupiter, Saturn, and Uranus; and the ninth, to the theory of comets. In the tenth book the author investigates various subjects relating to the system of the universe.
But the analogy does not end here. Just as with the planets, there is at first a general increase of size on travelling inwards from Neptune and Uranus, which do not differ very widely, to Saturn, which is much larger, and to Jupiter, which is the largest; so of the eight satellites of Saturn, the largest is not the outermost, but the outermost save two; so of Jupiter's four secondaries, the largest is the most remote but one.
These were completed, and in September of 1845, Challis informed Sir George Airy that according to the calculations of Adams the perturbations of Uranus were due to the influence of an unknown planet beyond. The young mathematician indicated in his conclusions at what point in the heavens the ultra-Uranian world was then traveling, and where it might be found.
Why the name of Cronus should mean 'horned, when he is never represented with horns, it is hard to say. Brown would like to behorn them. Preller illustrates the mutilation of Uranus by the Maori tale of Tutenganahau. The child-swallowing he connects with Punic and Phoenician influence, and Semitic sacrifices of men and children.
It was necessary, however, to follow up the problem more precisely, and accordingly an application was made through Professor Challis, the Director of the Cambridge Observatory, to the Astronomer Royal, with the object of obtaining from the observations made at Greenwich Observatory more accurate values for the disturbances suffered by Uranus.
It is strange but true that Dr. Finsen had never seen a smallpox patient at that time, but he knew the nature of the disease, and that the sufferer was affected by its eruption first and worst on the face and hands that is to say, on the parts of the body exposed to the light and he was as sure of his ground as was Leverrier when, fifty years before, he bade his fellow astronomers look in a particular spot of the heavens for an unknown planet that disturbed the movements of Uranus.
At last the laborious calculations proved satisfactory, and, confident of the result, Leverrier sent to the Berlin observatory, requesting that search be made for the disturber of Uranus in a particular spot of the heavens. Dr. Galle received the request September 23, 1846.
As already stated, Herschel named it, in compliment to George III., the Georgium Sidus; in this copying the example of Galileo with his "Medicaean stars." Afterwards, astronomers christened it Herschel, and subsequently Uranus, in conformity with the mythological nomenclature of the other planets.
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