Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 51
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 vear … Fig. 39- to year. It will be seen, from Figs. 3S and 39, that thedeclination is also slowly changing. 30. Nutation. — The gyratory motion of the earths axisis not perfectly regular and uniform. The earths axis has ASTRONOMY. 35
Astronomy
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