WordNet
n. an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object; "the cinema relies on apparent motion"; "the succession of flashing lights gave an illusion of movement" [syn: motion, apparent movement, movement]
Wikipedia
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, apparent motion of objects in the sky due to the Earth's rotation on its axis
- Parallax, 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
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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
Usage examples of "apparent motion".
This apparent motion is simply due to the fact that the observed direction of the light ray coming from the star depends on the velocity of the earth relative to the star.
I can estimate the distance to my finger from the amount of this apparent motion, or parallax.
The annual or yearly apparent motion is much slower from west to east against the background of the starry landscape through a path known as the ecliptic, or zodiacal circle (containing the twelve zodiacal signs).
From the apparent motion of the constellations across the sky, from the southern hemisphere constellations that she could make out, and from the Big Dipper lying near the northern horizon, she deduced that they were in tropicallatitudes.
From the apparent motion of the constellations across the sky, from the southern hemisphere constellations that she could make out, and from the Big Dipper lying near the northern horizon, she deduced that they were in tropical latitudes.
At the moment, the only apparent motion was the relentless drip of fluid in the millipore chamber of the IV line.
The orbit of this planet was assuredly interior to the orbit of the earth, because it accompanied the sun in its apparent motion.
For an animal with side-mounted eyes, forward movements result in parallax shifts (apparent motion of near objects relative to distant objects).
Each step the man took ended with his foot on the next stone nearer the mansion, even though the apparent motion of his leg should have taken him off the path or back the way he'd come.
Sharing the odd apparent motion of these planets were the Sun and Moon, making seven wandering bodies in all.
And it did move: its owner could sit within it on a green plush seat, and as great weights fell and clockwork ticked over, the dome of many-colored glass would move just as the heavens did in their apparent motion.
There was little apparent motion, though the pilot's thermal scanner showed that some of the armor was alive, awaiting orders.
He could aim for Weald itself, allowing, of course, for the lag in the apparent motion of its image because of the limited speed of light.