plural of diurnal aberration

(astronomy) A deviation due to the Earth's orbital motion.

(astronomy) A deviation of where a planet appears to be, due to the motion of the planet during the time that the light reaches the Earth.

(astronomy) A deviation due to the earth's axial rotation.

(astronomy) A spurious circle around the true circle of the Sun.

plural of chromatic aberration

(astronomy) A phenomenon that produces an apparent motion of celestial objects about their true positions, dependent on the velocity of the observer.