Apparent motion

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Apparent motion may refer to:

In astronomy:

  • Apparent motion, the appearance that objects in the night sky move against the typical direction of motion
  • 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

In 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
  • The illusion of movement deliberately sought by certain forms of op art (optical art)

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