![]() If viewed from a position not exactly perpendicular to the ruler, the apparent position will shift and the reading will be less accurate than the ruler is capable of.Ī similar error occurs when reading the position of a pointer against a scale in an instrument such as an analog multi-meter. For example, if measuring the distance between two ticks on a line with a ruler marked on its top surface, the thickness of the ruler will separate its markings from the ticks. Measurements made by viewing the position of some marker relative to something to be measured are subject to parallax error if the marker is some distance away from the object of measurement and not viewed from the correct position. One way to understand parallax is to look at a nearby object and note its position against a wall. 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. Explanation: Parallax is a method of using two points of observation to measure the distance to an object by observing how it appears to move against a background. A good example of parallax can be seen in the dashboard of your vehicle that uses a needle-style speedometer. It is measured by the angle between two lines. ![]() In essence, parallax is the phenomenon which occurs when an object is viewed from different positions. ![]() In astronomy, annual parallax is the only direct way to measure distance to stars outside the solar system. Parallax error in measuring instruments is when you see a different reading based on the direction in which you view that measurement. For nearby stars, distance is determined directly from parallax by using trigonometry and the size of Earths orbit. Parallax is the perceived change in position of an object seen from two different places. ![]()
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