LESSON XXIX
THE SUN
How far away from us is the sun? Are we to answer just as we think, or just as we know? On a fine summer day, when we can see him clearly, it looks as if a short trip in a balloon might take us to his throne in the sky, yet we know—because the astronomers tell us so—that he is more than ninety-one millions of miles distant from our earth.
Ninety-one millions of miles! It is not easy even to imagine this distance; but let us fancy ourselves in an express-train going sixty miles an hour without making a single stop. At that flying rate we could travel from the earth to the sun in one hundred and seventy-one years,—that is, if we had a road to run on and time to spare for the journey.
Arriving at the palace of the sun, we might then have some idea of his size. A learned Greek who lived more than two thousand years ago thought the sun about as large as the Peloponnesus; if he had lived in our country, he might have said, "About as large as Massachusetts."
As large as their peninsula! The other Greeks laughed at him for believing that the shining ball was so vast. How astonished they would have been—yes, and the wise man too—if they had been told that the brilliant lord of the day was more than a million times as large as the whole world!