Parallax | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-22

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Parallax


00:01:53 1 Visual perception
00:02:47 2 Astronomy
00:03:24 2.1 Stellar parallax
00:06:52 2.2 Distance measurement
00:08:26 2.3 Diurnal parallax
00:08:55 2.4 Lunar parallax
00:14:41 2.5 Solar parallax
00:18:14 2.6 Moving-cluster parallax
00:18:57 2.7 Dynamical parallax
00:19:24 2.8 Derivation
00:22:50 2.9 Error
00:24:26 2.10 Spatio-temporal parallax
00:24:57 3 Metrology
00:26:16 4 Photogrammetry
00:26:51 5 Photography
00:27:48 6 Weapon sights
00:28:51 6.1 Optical sights
00:32:18 7 Artillery gunfire
00:32:49 8 Rangefinders
00:33:06 9 As a metaphor
00:34:56 10 See also



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SUMMARY
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Parallax (from Ancient Greek  παράλλαξις (parallaxis), meaning 'alternation') 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. Due to foreshortening, nearby objects show a larger parallax than farther objects when observed from different positions, so parallax can be used to determine distances.
To measure large distances, such as the distance of a planet or a star from Earth, astronomers use the principle of parallax. Here, the term parallax is the semi-angle of inclination between two sight-lines to the star, as observed when Earth is on opposite sides of the Sun in its orbit. These distances form the lowest rung of what is called "the cosmic distance ladder", the first in a succession of methods by which astronomers determine the distances to celestial objects, serving as a basis for other distance measurements in astronomy forming the higher rungs of the ladder.
Parallax also affects optical instruments such as rifle scopes, 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.
A simple everyday example of parallax can be seen in the dashboard of motor vehicles that use a needle-style speedometer gauge. When viewed from directly in front, the speed may show exactly 60; but when viewed from the passenger seat the needle may appear to show a slightly different speed, due to the angle of viewing.