The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 53
Fig. 38. Since celestial longitude and right ascension are bothmeasured from the first point of Aries, the longitude andright ascension of the stars are slowly changing from year … Fig- 39- to year. It will be seen, from Figs. 38 and 39, that thedeclination is also slowly changing. 30. Nutation. — The gyratory motion of the earths axis• is not perfectly regular and uniform. The earths axis has ASTRONOMY. 35
Astronomy
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