Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 122
the pole of the ecliptic in an undu-lating curve, as shown in Fig. 48. Practi-cally, nutation depends upon the moon only ;the period of 18.6 years being that of therevolution of the moons nodes (Art. 128). 121. Change in the Obliquity of the Eclip-tic.—It was stated in Art. 118 that the lati-tudes… … 113 ABERRATION. of the ecliptic. The obliquity of the ecliptic in 1889 was23° 27 13: and the annual amount of diminution to which itis now subject is 0.46. Mathematical investigations show thatafter certain moderate limits have been reached this diminutionwill cease, and the obliquity will begin to…
Astronomy
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