the aberration of light arising from the effect of the earth's rotation upon the apparent direction of motion of light.
See also: Diurnal
diurnal aberration
diurnal aberration
[dī′ərn·əl ‚ab·ə′rā·shən] (astronomy) Aberration caused by the rotation of the earth; its value varies with the latitude of the observer and ranges from zero at the poles to 0.31 second of arc. Also known as daily aberration.