The Solar System: a Study of Recent Observations
The Solar System: a Study of Recent Observations
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In our eReader you can find the full English version of the book. Read The Solar System: a Study of Recent Observations Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Solar System: a Study of Recent Observations
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The first reliable measures of the size and shape of Mars were those made by Sir William Herschel in 1784, who found the apparent diameter of the planet at distance unity to be 9."18. He also noted a flat- tening at the poles similar to the known ellipticity of the earth. According to him, however, this polar com- pression was much greater than that of our planet, 202 THE SOLAR SYSTEM being nearly ^. Modem observations make the diameter somewhat greater, Le Verrier placing the equatorial diamet...er at ll/l, others making it as low as 9/2. The measures are rather discordant, but with the exception of that of Le Verrier, which is manifestly too high, they all range around 9/85.
With a solar parallax of S.^SO, this would make the real diameter of Mars 4210 miles. An error of one tenth of a second of arc in the measured diameter is equivalent to an error of 45 miles in the real diameter of the planet. As the error, if any, can hardly be as large as this, the size of Mars is known with extreme accuracy.
What to read after The Solar System: a Study of Recent Observations?
You can find similar books in the "Read Also" column, or choose other free books by Charles Lane Poor to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The first reliable measures of the size and shape of Mars were those made by Sir William Herschel in 1784, who found the apparent diameter of the planet at distance unity to be 9."18. He also noted a flat- tening at the poles similar to the known ellipticity of the earth. According to him, however, this polar com- pression was much greater than that of our planet, 202 THE SOLAR SYSTEM being nearly ^. Modem observations make the diameter somewhat greater, Le Verrier placing the equatorial diamet...er at ll/l, others making it as low as 9/2. The measures are rather discordant, but with the exception of that of Le Verrier, which is manifestly too high, they all range around 9/85.
With a solar parallax of S.^SO, this would make the real diameter of Mars 4210 miles. An error of one tenth of a second of arc in the measured diameter is equivalent to an error of 45 miles in the real diameter of the planet. As the error, if any, can hardly be as large as this, the size of Mars is known with extreme accuracy.
What to read after The Solar System: a Study of Recent Observations?
You can find similar books in the "Read Also" column, or choose other free books by Charles Lane Poor to read onlineMoreLess
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