It was to these qualities that he owed his discoveries of the aberration of light and the nutation of the earth's axis.
The position of the equinox independent of the effects of nutation.
In the case of nutation the North Pole remains in the same geographical position, but points to a different part of the heavens.
Sometimes this path is loopy, and its little nods correspond to nutation.
Many growing stems have also a movement of nutation, that is, of nodding successively in different directions.
This is scientifically denominated the nutation of the earth.
It is affected by the motions of Precession and nutation, of which the former has been known since the time of Hipparchus.
This led him to the discovery of the “aberration” of light and of nutation.
This is the position for any day which it seems to occupy in the heavens, as affected with aberration and nutation.
Bradley also discovered that the positions of the stars were affected by the wabbling of the earth's axis, called its "nutation."
1610s, "action of nodding," from Latin nutationem (nominative nutatio), noun of action from past participle stem of nutare "to nod," from PIE *neu- "to nod" (see numinous). Astronomical use is from 1715. Related: Nutational.
nutation nu·ta·tion (nōō-tā'shən, nyōō-)
The act of nodding the head, especially involuntarily.