An Introduction to Astronomy Designed As a Text book for the Students of Yale C
An Introduction to Astronomy Designed As a Text book for the Students of Yale C
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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 Yale C 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 Yale C
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5305887X223=6585. 32.
Hence, if the sun and moon were to leave the moon's node toge- ther, after the sun had been round to the same node 19 times, the moon would have performed very nearly 223 synodical revolu- tions, and would, therefore, at the end of this period meet at the same node, to repeat the same circuit. And since eclipses of the sun and moon depend upon the relative position of the sun, the moon, and node, these phenomena are repeated in nearly the same order, in each of those perio...ds. Hence, this period, consisting of about 18 years and 10 days, under the name of the Saros, was used by the Chaldeans and other ancient nations in predicting eclipses.
234. The Metonic Cycle is not the same with the Saros, but consists of 19 tropical years. During this period the moon makes * Francceur, Uranog. P. 158. Robison's Phys. Astronomy, Art. 264.
136 THE MOON.
very nearly 235 synodical revolutions, and hence the new and full moons, if reckoned by periods of 19 years, recur at the same dates.
What to read after An Introduction to Astronomy Designed As a Text book for the Students of Yale C?
You can find similar books in the "Read Also" column, or choose other free books by Denison Olmsted to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
5305887X223=6585. 32.
Hence, if the sun and moon were to leave the moon's node toge- ther, after the sun had been round to the same node 19 times, the moon would have performed very nearly 223 synodical revolu- tions, and would, therefore, at the end of this period meet at the same node, to repeat the same circuit. And since eclipses of the sun and moon depend upon the relative position of the sun, the moon, and node, these phenomena are repeated in nearly the same order, in each of those perio...ds. Hence, this period, consisting of about 18 years and 10 days, under the name of the Saros, was used by the Chaldeans and other ancient nations in predicting eclipses.
234. The Metonic Cycle is not the same with the Saros, but consists of 19 tropical years. During this period the moon makes * Francceur, Uranog. P. 158. Robison's Phys. Astronomy, Art. 264.
136 THE MOON.
very nearly 235 synodical revolutions, and hence the new and full moons, if reckoned by periods of 19 years, recur at the same dates.
What to read after An Introduction to Astronomy Designed As a Text book for the Students of Yale C?
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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