An Introduction to Astronomy: Designed As a Text book for the Students of ...
An Introduction to Astronomy: Designed As a Text book for the Students of ...
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In our eReader you can find the full English version of the book. Read An Introduction to Astronomy: Designed As a Text book for the Students of ... 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 An Introduction to Astronomy: Designed As a Text book for the Students of ...
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The nodes of Mercury lie in that part of the earth's orbit which it passes in the months of May and Novem- ber. It is only in these months, therefore, that transits of Mer- cury can occur. For a similar reason, those of Venus occur only Digitized by VjOOQIC TRANSITS OF THE INFERIOR PLANETS. 187 m June and December. Since the nodes of both planets hav« a small retrograde motion, the months in which transits occur, will change in the course of ages ; but the months for transits will for a long ti...me remain the same as at present, since the nodes of Mercury change their places only in 13', and those of Venus only 31' in a century.* The first prediction of this phenomenon was made by Kepler, and was that of a transit of Mercury which occurred on, the 7th of November, 1631. As early as 1629, Kepler announced to as- tronomers that his tables gave the latitude of Mercury, at the conjunction which was to take place on that day, less than the sun's semi-diameter ; consequently, that the planet in passing by the sun woul4 be nearer the sun's center than the length of the sun's radius, and of course appear on his disk.
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To quickly assess the difficulty of the text, read a short excerpt:
The nodes of Mercury lie in that part of the earth's orbit which it passes in the months of May and Novem- ber. It is only in these months, therefore, that transits of Mer- cury can occur. For a similar reason, those of Venus occur only Digitized by VjOOQIC TRANSITS OF THE INFERIOR PLANETS. 187 m June and December. Since the nodes of both planets hav« a small retrograde motion, the months in which transits occur, will change in the course of ages ; but the months for transits will for a long ti...me remain the same as at present, since the nodes of Mercury change their places only in 13', and those of Venus only 31' in a century.* The first prediction of this phenomenon was made by Kepler, and was that of a transit of Mercury which occurred on, the 7th of November, 1631. As early as 1629, Kepler announced to as- tronomers that his tables gave the latitude of Mercury, at the conjunction which was to take place on that day, less than the sun's semi-diameter ; consequently, that the planet in passing by the sun woul4 be nearer the sun's center than the length of the sun's radius, and of course appear on his disk.
What to read after An Introduction to Astronomy: Designed As a Text book for the Students of ...?
You can find similar books in the "Read Also" column, or choose other free books by Denison Olmsted to read onlineMoreLess
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