The Twentieth Century Atlas of Popular Astronomy Comprising in Twenty-Two Plates a Complete Series of Illustrations of the Heavenly Bodies
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In our eReader you can find the full English version of the book. Read The Twentieth Century Atlas of Popular Astronomy Comprising in Twenty-Two Plates a Complete Series of Illustrations of the Heavenly Bodies 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 Twentieth Century Atlas of Popular Astronomy Comprising in Twenty-Two Plates a Complete Series of Illustrations of the Heavenly Bodies
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The orbit of the planet Venus lies in order of distance next nearer to the sun than the earth's. Hence, when Venus is nearest the earth, in inferior con- junction, a method similar to that used with Mars to obtain its parallax, and from it that of the sun, might have been adopted, if it had not been for the fact that Venus in inferior conjunction rises and sets nearl)' at the same time as the sun. Hence Venus is visible only under most unfavourable circumstances, in daylight, when the stars, ex...cept the very brightest, are invisible. It must be remembered that the position of the planet in such observations as these is fixed by measuring its distance from neighbouring stars.
44 ASTRONOMY.
However, Venus occasionally passes so directly between us and the sun that it moves across or transits the sun's disc appearing as a round black spot on the sun. Two methods have been devised for utilising these transits of Venus to determine the solar parallax.
As early as 1716 Halley suggested the following method.
What to read after The Twentieth Century Atlas of Popular Astronomy Comprising in Twenty-Two Plates a Complete Series of Illustrations of the Heavenly Bodies?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Heath to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The orbit of the planet Venus lies in order of distance next nearer to the sun than the earth's. Hence, when Venus is nearest the earth, in inferior con- junction, a method similar to that used with Mars to obtain its parallax, and from it that of the sun, might have been adopted, if it had not been for the fact that Venus in inferior conjunction rises and sets nearl)' at the same time as the sun. Hence Venus is visible only under most unfavourable circumstances, in daylight, when the stars, ex...cept the very brightest, are invisible. It must be remembered that the position of the planet in such observations as these is fixed by measuring its distance from neighbouring stars.
44 ASTRONOMY.
However, Venus occasionally passes so directly between us and the sun that it moves across or transits the sun's disc appearing as a round black spot on the sun. Two methods have been devised for utilising these transits of Venus to determine the solar parallax.
As early as 1716 Halley suggested the following method.
What to read after The Twentieth Century Atlas of Popular Astronomy Comprising in Twenty-Two Plates a Complete Series of Illustrations of the Heavenly Bodies?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Heath to read onlineMoreLess
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