Astronomy : a Popular Handbook
Astronomy : a Popular Handbook
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In our eReader you can find the full English version of the book. Read Astronomy : a Popular Handbook 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 Astronomy : a Popular Handbook
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It is possible to explain the cause of precession by the aid of Newton's law of gravitation. We have already found K 129 Digitized by VjOOQlC ASTRONOMY that the earth is not truly Bpherical, but that it is somewhat flattened at the poles. This amoimts in effect to a spherical earth, with a girdle of protuberant material surrounding the equator. In other words, the earth has its biggest girth around the terrestrial equator. Figure 37 is intended to illustrate the existing state of affairs. It sh...ows* the spherical earth, with its north pole (N. P.), its equatorial pro- tuberance, and the planes of the equator and ecliptic.
Now the sun and moon both exert a gravitational attrac- tion upon the earth, and also upon its equatorial protuber- ance. And, as we have already seen, the sun is always in the plane of the ecUptic ; we may add as a fact that the moon also happens to pursue an orbit that never goes very far from the same plane. But the lunar and solar attractions affect most strongly that part of the protuberant ring which is nearest to them.
What to read after Astronomy : a Popular Handbook?
You can find similar books in the "Read Also" column, or choose other free books by Harold Jacoby to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It is possible to explain the cause of precession by the aid of Newton's law of gravitation. We have already found K 129 Digitized by VjOOQlC ASTRONOMY that the earth is not truly Bpherical, but that it is somewhat flattened at the poles. This amoimts in effect to a spherical earth, with a girdle of protuberant material surrounding the equator. In other words, the earth has its biggest girth around the terrestrial equator. Figure 37 is intended to illustrate the existing state of affairs. It sh...ows* the spherical earth, with its north pole (N. P.), its equatorial pro- tuberance, and the planes of the equator and ecliptic.
Now the sun and moon both exert a gravitational attrac- tion upon the earth, and also upon its equatorial protuber- ance. And, as we have already seen, the sun is always in the plane of the ecUptic ; we may add as a fact that the moon also happens to pursue an orbit that never goes very far from the same plane. But the lunar and solar attractions affect most strongly that part of the protuberant ring which is nearest to them.
What to read after Astronomy : a Popular Handbook?
You can find similar books in the "Read Also" column, or choose other free books by Harold Jacoby to read onlineMoreLess
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