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Astronomical precession: A good and a bad first‐order approximation

 

作者: Bernhard M. Haisch,  

 

期刊: American Journal of Physics  (AIP Available online 1981)
卷期: Volume 49, issue 7  

页码: 636-640

 

ISSN:0002-9505

 

年代: 1981

 

DOI:10.1119/1.12450

 

出版商: American Association of Physics Teachers

 

关键词: PRECESSION;ASTROMETRY;EQUATOR;EARTH PLANET

 

数据来源: AIP

 

摘要:

The problem of calculating the precession of the equinoxes due to the torque of the sun and moon on the Earth is often cited in mechanics texts as a classic example of the behavior of a heavy symmetrical top. Unfortunately this problem is often alluded to but seldom solved. A simple equatorial band model for the Earth and smeared out mass distributions for the sun and moon are used herein to solve this problem. It is found that one intuitively apparent approximation for the gravitational force on the band results in a precession period that is too long by a factor of 3/2, whereas a slightly more sophisticated approach provides an answer good to better than one percent.

 

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