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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