Apparent motion is an optical illusion that makes stationary objects appear to be moving when viewed in quick succession or in relation to moving objects.
DIRECT MOTION, in astronomy, the apparent motion of a body .of the solar system on the celestial sphere in the direction from west to east; so called because this is the usual direction of revolution and rotation of the heavenly bodies.
Its weak point is that the apparent motion of the node depends partly upon the motion of the ecliptic, which cannot be determined with equal precision.
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