// Workers AI · dad joke modeWhy was apparent motion a bad liar? It couldn't keep a straight track.

Apparent motion may refer to:

Astronomy

• Aberration of light, an apparent shift in position of celestial objects due to the finite speed of light and the motion of Earth in its orbit around the Sun
• Diurnal motion, the apparent motion of objects in the sky due to the Earth's rotation on its axis
• Parallax, the apparent motion of objects due to the changing angle of observation of an observer on Earth revolving around the Sun

Perceptual illusions

• Beta movement, an illusion of movement where two or more still images are combined by the brain into surmised motion
• Illusory motion, the appearance of movement in a static image
• Phi phenomenon, an illusion of movement created when two or more adjacent lights blink on and off in succession
• Stroboscopic effect, a phenomenon that occurs when continuous motion is represented by a series of short or instantaneous samples
  • Wagon-wheel effect, temporal aliasing effect in which a spoked wheel appears to rotate differently from its true rotation

Other uses

• Optical flow, a term used in computer science for the apparent motion of objects in a scene caused by the relative motion between an observer and the scene
• The motion of objects observed from a non-inertial reference frame