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Updated: May 4, 2025
Of the thirteen constituting this group, twelve have orbits falling between those of Mars and Jupiter: one only having its aphelion beyond the orbit of Jupiter. That is to say, nearly all of them frequent the same region as the planetoids. By implication, they are similarly associated in respect of their periods.
'Hair like arctic snows, failure of vital heat, palsy that shakes the head as in the porcelain toys on our mantel-pieces, asthma that shakes the whole fabric these they absolutely fancy themselves to see. They absolutely hear the tellurian lungs wheezing, panting, crying, 'Bellows to mend! periodically as the Earth approaches her aphelion.
This is more eccentric than the orbit of any other planet, except some of the asteroids. The sun being situated in one focus of the elliptical orbit, when Mercury is at perihelion, or nearest to the sun, its distance from that body is 28,500,000 miles, but when it is at aphelion, or farthest from the sun, its distance is 43,500,000 miles. The difference is no less than 14,000,000 miles!
"You think, then," said Servadac, with a smile, "you have determined the perihelion of our orbit; but how about the aphelion? Can you form a judgment as to what distance we are likely to be carried?" "You are asking too much," remonstrated the count.
Tending upward and sunward from the aphelion of barbarism, the race attained the perihelion of civilization only to plunge downward once more to its nether goal in the regions of chaos. This, of course, was an extreme opinion, but I remember serious men among my acquaintances who, in discussing the signs of the times, adopted a very similar tone.
You are in the middle of yours. In what part of its orbit the nation with which we are carried along moves at this instant it is not easy to conjecture. It may, perhaps, be far advanced in its aphelion, but when to return?
Croll brought together a mass of evidence to support the view, that, at epochs of considerable eccentricity, the hemisphere of which the winter, occurring at aphelion, was both intensified and prolonged, must have undergone extensive glaciation; while the opposite hemisphere, with a short, mild winter, and long, cool summer, enjoyed an approach to perennial spring.
But this heat, which is sufficient to evaporate the waters, would have formed a thick ring of cloud, which would have modified that excessive temperature; hence the compensation between the cold of the aphelion and the heat of the perihelion." "At how many degrees," asked Nicholl, "is the temperature of the planetary spaces estimated?"
"The outbreak may happen again," said the lieutenant, calmly; "but it will be our fault, our own lack of vigilance, if we are taken by surprise." And so the conversation dropped. The 15th of January dawned; and the comet was 220,000,000 leagues from the sun. Gallia had reached its aphelion. Henceforth, then, with a velocity ever increasing, Gallia would re-approach the sun.
Measuring from a fixed position of the earth, it would give similarly a series of positions of Mars, which, though lying not far from the circle whose diameter was the axis of Mars' orbit, joining perihelion and aphelion, always fell inside the circle except at those two points.
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