- published: 06 Apr 2015
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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 semi-angle of inclination between those two lines. The term is derived from the Greek παράλλαξις (parallaxis), meaning "alteration". Nearby objects have a larger parallax than more distant objects when observed from different positions, so parallax can be used to determine distances.
Astronomers use the principle of parallax to measure distances to celestial objects including to the Moon, the Sun, and to stars beyond the Solar System. For example, the Hipparcos satellite took measurements for over 100,000 nearby stars. This provides a basis for other distance measurements in astronomy, the cosmic distance ladder. Here, the term "parallax" is the angle or semi-angle of inclination between two sight-lines to the star.
Parallax also affects optical instruments such as binoculars, microscopes, and twin-lens reflex cameras that view objects from slightly different angles. Many animals, including humans, have two eyes with overlapping visual fields that use parallax to gain depth perception; this process is known as stereopsis. In computer vision the effect is used for computer stereo vision, and there is a device called a parallax rangefinder that uses it to find range, and in some variations also altitude to a target.
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Actors: Logan Douglas Smith (actor), Geoffrey Rush (actor), Peter Sarsgaard (actor), Michael Clarke Duncan (actor), Tim Robbins (actor), Ryan Reynolds (actor), Jay O. Sanders (actor), Griff Furst (actor), Douglas M. Griffin (actor), Lance E. Nichols (actor), Clancy Brown (actor), Ritchie Montgomery (actor), Ryan Reynolds (actor), Angela Bassett (actress), Mark Strong (actor),
Plot: A cocky test pilot, Hal Jordan ('Ryan Reynolds (I)' (qv)), acquires superhuman powers when he is chosen by "the Ring", the willpower-fed source of power, of the Green Lantern Intergalactic Corps. He, reluctantly at first, takes on the challenges these superheroes face. Putting his self-doubts aside, and spurred on by his sense of duty and love for his beautiful, intellectually equal, colleague, Carol Ferris ('Blake Lively' (qv)), he is soon called to defend mankind from Parallax, a super-powerful being who feeds on fear. He is the universe's last chance, as many Lanterns have been killed and the Corps is weakened. And he might just be the right Lantern for the job of keeping the world safe from harm. Based on the characters of DC Comics series "Green Lantern".
Keywords: 1990s, 2010s, 3600-recruits, aerial-drone, air-base, airplane-accident, airplane-explosion, alien, alien-contact, alien-infection