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The Sun
E
ARLY in the morning Uncle Paul and his nephew climbed the
neighboring hill to see the sunrise. It was still quite
dark.
The only persons they met in passing through the
village were the milkmaid, on her way to town with butter
and milk, and the blacksmith hammering away at the
Sheltered by a clump of juniper-trees, Uncle Paul and the three
children await the grand spectacle they have come to the top
of the hill to see. In the east the sky is getting lighter,
the stars turn pale and go out one by one. Flakes of rosy
cloud swim in a brilliant streak of light whence gradually
there rises a soft illumination. It reaches the zenith, and
the blue of day reappears with all its delicate
transparency. This cool morning light, this
half-daylight that precedes the rising of the sun, is the aurora or
morning twilight. In the meantime a lark, the joy of the
fields, takes wing to the highest clouds, like a rocket, and
is the first to salute the awakening day. It mounts and
mounts, always singing, as if to get in front of the sun;
and with its enthusiastic songs it celebrates in the high
heavens the glory of the
And here it is: a bright thread of light bursts forth, and
the tops of the mountains are suddenly illumined. It is the
edge of the sun beginning to rise. The earth trembles before
the radiant apparition. The shining disc keeps rising: there
it is almost whole, now completely so, like a grindstone of
Then Uncle Paul, in the shade of the juniper-trees, began his talk. "What is the sun? Is it large, is it very far away? That, my children, is what I should now like to teach you. "To measure the distance from one point to another, you know of only one means: that of laying off, as many times as it will go, the unit of length, the meter, from one end to the other of the distance to be measured. But science has methods adapted to the measuring of distances that one cannot travel in person; it tells us what must be done to find the height of a tower or mountain, without going to the top, without even approaching the base. They are methods of the same kind as are employed to calculate the distance that separates us from the sun. The result of the astronomer's calculations is that we are distant from the sun 38 millions of leagues of 4000 meters each. This distance is equivalent to 3800 times the circumference of the earth. I told you that, to make the tour of the terrestrial globe, a man, a good walker, capable of walking ten leagues a day, would take about three years. He would need, then, nearly twelve thousand years to go from the earth to the sun, supposing that the journey were possible. The longest human life is incomparably too short for a journey of this length ever to be accomplished by one person; and a hundred generations of a hundred years each, succeeding one another on the journey and uniting their efforts, would not even be enough." "And a locomotive," asked Jules, "how long would it take to get over that distance?" "Do you remember how fast it goes?" "I saw it myself the day we took the trip with you. If one looks out, the road seems to fly back so fast it frightens you and makes you dizzy." "The locomotive that drew us went at the rate of about ten leagues an hour. Let us suppose a locomotive that never stops and that goes still faster, or fifteen leagues an hour. Rushing at that speed, the engine would go from one end of France to the other in less than a day; and yet, to cover the distance from the earth to the sun, it would take more than three centuries. For such a journey, the fastest engine ever made by the hand of man is hardly more than a sluggish snail ambitious to make the tour of the world." "And I who thought, not long ago," said Emile, "that by climbing to the roof and with the aid of a long reed I could touch the sun!" "To one who trusts to appearances the sun is only a dazzling disc, at the most as large as a grindstone." "That is what I said yesterday," observed Jules. "But, as it is so far away, it might well be as large as a millstone." "In the first place, the sun is not flat like a grindstone; it has, like the earth, the shape of a ball. Furthermore, it is much larger than a grindstone, or even than a millstone. "Objects seem to us small in proportion to their distance from us, until finally they become invisible. A high mountain seen from afar seems only a moderate-sized hill; the cross that surmounts a steeple, seen from below, looks very small despite its very large dimensions. It is the same with the sun: it looks so small only because it is very far off; and as the distance is prodigious, its size must be excessive; if not, instead of looking to us like a dazzling grindstone, it would cease to be visible to us. "You found the terrestrial globe enormous; and, despite my comparisons, your imagination, I am sure, has not been able to picture things properly. How will it be with the sun, which is one million four hundred thousand times as large as the earth! If we suppose the sun hollow like a spherical box, to fill it would take one million four hundred thousand balls the size of the earth. "Let us try another comparison. To fill the measure of capacity called the liter, it takes about 10,000 grains of wheat. It would take, then, 100,000 to fill 10 liters or one decaliter, and 1,400,000 to fill 14 decaliters. Well, suppose in one pile 14 decaliters of wheat, and beside it one solitary grain of wheat. For the respective sizes, this isolated grain represents the earth; the pile of 14 decaliters represents the sun." "How wrong we were!" Claire exclaimed. "This little shining disc, to which, for fear of exaggeration, we should have hesitated to assign the dimensions of a millwheel, is a globe so big that in comparison with its gigantic size the earth is as nothing." "Oh, God in heaven!" cried Jules. "Yes, my friend, you may well say, 'God in heaven,' for the mind is bewildered at the thought of this inconceivable mass. Say: God in heaven! how great You are, You who out of nothing have created the sun and the earth, and hold them both in the shadow of Your hand!
"I have not finished, my dear children. One day, in speaking
to you of lightning and thunder, I told you that light moves
with excessive rapidity. In fact, to come to us from the
sun, to cover the distance that a locomotive at its highest
speed would take three hundred years to cover, a ray of
light needs only the half of a quarter of an hour, or about
eight minutes. Now listen to this. Astronomy teaches us that
each star, small as it may appear from here, is itself a sun
comparable in size to ours; it tells us that these suns, of
which we with the naked eye can perceive only a very small
part, are so numerous that it is impossible to count them;
it tells us that their distance is so great that, to come to
us from the nearest star, light, which travels so fast, as I
have just told you, takes nearly four years; to reach us
from others that are by no means the most distant it takes
whole centuries. After that, if you can, estimate the
distance that separates us from those |
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