Recreations in Astronomy
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DIAMETER, 4211 MILES. REVOLUTION, AXIAL, 24H. 37M. 22. 7S. ; ORBITAL, 686. 98 DAYS. VELOCITYPER MINUTE, 899 MILES. SATELLITES, TWO.
[Illustration: Fig. 62. --Apparent Size of Mars at Mean and ExtremeDistances. ] At intervals, on an average of two years one month and nineteendays, we find rising, as the sun goes down, the reddest star inthe heavens. Its brightness is exceedingly variable; sometimesit scintillates, and sometimes it shines with a steady light. Itsmarked peculiarities demand a clos...e study. We find it to be Mars, the fiery god of war. Its orbit is far from circular. At perihelionit is 128, 000, 000 miles from the sun, and at aphelion 154, 000, 000;hence its mean distance is about 141, 000, 000. So great a changein its distance from the sun easily accounts for the change inits brilliancy. Now, if Mars and the earth revolved in circularorbits, the one 141, 000, 000 miles from the sun, and the other92, 000, 000, they would approach at conjunction within 49, 000, 000miles of each other, and at opposition be 233, 000, 000 miles apart.
What to read after Recreations in Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Warren Henry White to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
DIAMETER, 4211 MILES. REVOLUTION, AXIAL, 24H. 37M. 22. 7S. ; ORBITAL, 686. 98 DAYS. VELOCITYPER MINUTE, 899 MILES. SATELLITES, TWO.
[Illustration: Fig. 62. --Apparent Size of Mars at Mean and ExtremeDistances. ] At intervals, on an average of two years one month and nineteendays, we find rising, as the sun goes down, the reddest star inthe heavens. Its brightness is exceedingly variable; sometimesit scintillates, and sometimes it shines with a steady light. Itsmarked peculiarities demand a clos...e study. We find it to be Mars, the fiery god of war. Its orbit is far from circular. At perihelionit is 128, 000, 000 miles from the sun, and at aphelion 154, 000, 000;hence its mean distance is about 141, 000, 000. So great a changein its distance from the sun easily accounts for the change inits brilliancy. Now, if Mars and the earth revolved in circularorbits, the one 141, 000, 000 miles from the sun, and the other92, 000, 000, they would approach at conjunction within 49, 000, 000miles of each other, and at opposition be 233, 000, 000 miles apart.
What to read after Recreations in Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Warren Henry White to read onlineMoreLess
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