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proper motion
(Encyclopedia)proper motion, in astronomy, apparent movement of a star on the celestial sphere, usually measured as seconds of arc per year; it is due both to the actual relative motions of the sun and the star thr...harmonic motion
(Encyclopedia)CE5 Harmonic motion is exhibited by a weight vibrating on the end of a spring. In A, the displacement of the object from its equilibrium position and the acceleration of the object are at a maximum...motion sickness
(Encyclopedia)motion sickness, waves of nausea and vomiting experienced by some people, resulting from the sudden changes in movement of a vehicle. The ailment is also known as seasickness, car sickness, train sick...retrograde motion
(Encyclopedia)retrograde motion, in astronomy, real or apparent movement of a planet, dwarf planet, moon, asteroid, or comet from east to west relative to the fixed stars. The most common direction of motion in the...simple harmonic motion
(Encyclopedia)simple harmonic motion: see harmonic motion. ...perpetual-motion machine
(Encyclopedia)perpetual-motion machine, device that would be able to operate continuously and supply useful work, in violation of the laws of thermodynamics. A machine that would produce more energy in the form of ...Newton's laws of motion
(Encyclopedia)Newton's laws of motion: see motion. ...Motion, Sir Andrew Peter
(Encyclopedia)Motion, Sir Andrew Peter, 1952–, English poet and biographer, poet laureate of England (1999–2009), grad. University College, Oxford (B.A., 1974; M.Litt., 1977). He writes poems that are both lyri...Hays, Will H.
(Encyclopedia)Hays, Will H., 1879–1954, American politician and motion-picture executive, b. Sullivan, Ind.; his original name was William Harrison Hays. Hays became active in Indiana political affairs, was chair...Muybridge, Eadweard
(Encyclopedia)Muybridge, Eadweard ĕdˈwərd mīˈbrĭj [key], 1830–1904, English-born photographer and student of animal locomotion. Muybridge changed his name from Edward James Muggeridge. A gifted and obsessed...Browse by Subject
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