A compendium of spherical astronomy with its applications to the determination and reduction of positions of the fixed stars (1906)
Newcomb, Simon, 1835-1909 · New York, The Macmillan company; London, Macmillan and co., ltd. · leaf 268
ON 247 from the theory of rotating bodies, it is found that this motionmay be resolved into two, one depending on the longitudes ofthe sun and moon, and therefore periodic; the other independentof these longitudes, and therefore progressive. Each termexpressive of a periodic motion, if taken… … Fig. 27. The progressive motion includes that of precession, describedin the two preceding sections, But a part of this motion isdependent upon the longitude of the moons node, which makesa revolution in ]86 years. This part of the motion beingperiodic, is included in the nutation, and in fact…
Spherical astronomy · Stars
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