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Cassini and Schröter both noticed that markings on Jupiter travelled quicker the nearer they were to his equator; and Cassini even hinted at their possible assimilation to sun-spots. Denning has pointed out, no single period will satisfy the observations either of different markings at the same epoch, or of the same markings at different epochs.
In 1670 Cassini showed that these numbers were altogether inconsistent with the facts, and gave as his conclusion eighty-five million. The transit of Venus over the face of the sun, June 3, 1769, had been foreseen, and its great value in the solution of this fundamental problem in astronomy appreciated.
As a preliminary step towards carrying his determination into execution, he dismissed his servants, with the exception of Auguste, finally got rid of his lease in the Rue Cassini, whence he had removed his furniture in the preceding year; and then, feeling still a sneaking kindness for the city in which he had triumphed, he compromised by retreating to Sevres, there to study the ways and means of dwelling secure from pestering military summonses addressed to Monsieur de Balzac, alias Madame Widow Brunet, Man of Letters, Chasseur in the First Legion, and also, if not secure from, at least not so accessible to the calls of dunning creditors.
He had sent to the fair unknown a lock of his hair, which he had allowed to remain for some time uncut, in order to send one as long as possible; he had presented her with a perfumed casket, destined to be the mysterious receptacle of his letters; a friend had drawn a sketch of his apartment in the Rue Cassini, so that she might see what a pleasant little den the toiler had; and lastly he inserted in a copy of The Country Doctor an aquarelle, in which he was portrayed in the somewhat exaggerated guise of his own Doctor Bernassis.
But Herschel considered that the occasional brightness of the crater Aristarchus could not be thus explained. The spot had been seen before the time of Herschel's observations by Cassini and others. It has been seen since by Captain Kater, Francis Baily, and many others. Dr. Maskelyne tells us that in March 1794 it was seen by the naked eye by two persons.
He was much bewildered when he learnt that, on the 16th of June, 1721, the Pope had elevated to the cardinalship; his brother, who for ten years had been Bishop of Terracine and Benedictine monk of Mount Cassini. Dubois had expected that no promotion would be made in which he was not included. But here was a promotion of a single person only.
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"As to the feeling," said Cassini, with that shrug which no shoulders but those of a Frenchman can ever give, "it is a matter of taste; and perhaps we have no right to dictate in such matters to persons who would think a week a long lease of life, and who, instead of seven days, may not have so many hours.
Scientific cosmogony dates from the telescopic discovery made by Cassini an Italian astronomer, under whose care Louis XIV. placed the Observatory of Paris that the planet Jupiter is not a sphere, but an oblate spheroid, flattened at the poles.
But Cassini reflected that the king would not look at the comet again, and would very soon forget what was told him; so he described its future path in the heavens quite at random, with entire confidence that any deviation of the actual motion from his prediction would never be noted by his royal patron.
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