Aberration
n.
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A small periodical change of position in the stars and
other heavenly bodies, due to the combined effect of the motion of
light and the motion of the observer; called annual aberration, when
the observer's motion is that of the earth in its orbit, and daily or
diurnal aberration, when of the earth on its axis; amounting when
greatest, in the former case, to 20.4'', and in the latter, to 0.3''.
Planetary aberration is that due to the motion of light and the motion
of the planet relative to the earth.