Search results
Results From The WOW.Com Content Network
A parsec is the distance from the Sun to an astronomical object that has a parallax angle of one arcsecond (not to scale). The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,265 astronomical units (AU), i.e. 30.9 trillion kilometres (19.2 trillion miles).
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight and is measured by the angle or half-angle of inclination between those two lines. [1] [2] Due to foreshortening, nearby objects show a larger parallax than farther objects, so parallax can be used to determine distances.
Giuseppe Calandrelli noted stellar parallax in 1805-6 and came up with a 4-second value for the star Vega which was a gross overestimate. [3] The first successful stellar parallax measurements were done by Thomas Henderson in Cape Town South Africa in 1832–1833, where he measured parallax of one of the closest stars, Alpha Centauri.
A parallax barrier is a device placed in front of an image source, such as a liquid crystal display, to allow it to show a stereoscopic or multiscopic image without the need for the viewer to wear 3D glasses.
Since both effects are caused by the effect of orbital motion on alignment, they are very closely related. And since the effect is the same as parallax, just backwards (from the motion of the source rather than motion of the observer) it was called xallarap. The name stuck, and is now commonly used in astronomical literature. [4]
The Hal Jordan incarnation of Parallax as depicted in Green Lantern (vol. 3) #50 (March 1994). Art by Darryl Banks.. In 1994, in an effort to generate interest in its Green Lantern comics, DC replaced Hal Jordan, who had been the primary Green Lantern since the late 1950s, with the character Kyle Rayner, and eliminated the Green Lantern Corps which had served as supporting characters in the ...
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
Parallax Graphics, Inc., was an American developer and manufacturer of high-specification computer graphics cards for various platforms, and of supporting software. The company was founded in 1982 as Parallax Systems by two Cornell University graduates.