Define parallax error?

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It is due to the wrong displacement of the eye during reading measurement.
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A parallax error is an error in reading an instrument due to the eye of the observer and pointer are not in a line perpendicular to the plane of the scale.
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I am B. Tech(Computer Science/IT) graduate

Change in position of an object while viewing it by both eyes closing one eye first making 2nd one open then vice versa
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Expert English and Science Teacher

A parallax error is the perceived shift in an object's position as it is viewed from different angles. The error is most easily noticed by looking at a nearby object with one eye closed, then looking at it through the other eye. The apparent motion of the object is the parallax shift, and it is responsible...
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A parallax error is the perceived shift in an object's position as it is viewed from different angles. The error is most easily noticed by looking at a nearby object with one eye closed, then looking at it through the other eye. The apparent motion of the object is the parallax shift, and it is responsible for a small, but noticeable, error common to optical equipment. read less
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Though the parallax method for working out distances has been known since Euclid, even the closest stars are so distant that their shift could not be measured with the necessary precision until the 19th century. The largest stellar parallax, that of Alpha Centauri, is approximately 77 arcseconds. That...
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Though the parallax method for working out distances has been known since Euclid, even the closest stars are so distant that their shift could not be measured with the necessary precision until the 19th century. The largest stellar parallax, that of Alpha Centauri, is approximately 77 arcseconds. That is less than the width of a finger held at arm's length, and ancient equipment lacked the sensitivity to observe the shift read less
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Mathemagician, NTSE and OLYMPIAD tutor

parallax error is caused due to the way of looking at the scale from different angles if we look at an angle of 90 degree from the plane of scale then this error can be eliminated
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It is defined as the shift in the apparent position of an object due to the different position of viewing. The error is usually noticed by observing the nearby abject with one of the eye closed while watching from the other eye. The motion of that particular object is parallax shift which is for a small...
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It is defined as the shift in the apparent position of an object due to the different position of viewing. The error is usually noticed by observing the nearby abject with one of the eye closed while watching from the other eye. The motion of that particular object is parallax shift which is for a small but noticeable error. It is common for optical equipment. It is an error caused by people during the measuring of quantity if the observer’s eye is not at the proper angle to the scale on one is supposed to be reading. This error is called as a parallax error. It is occurred on the line of sight and is usually removed by careful observation. Hope this helps read less
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Alumni, IIT Delhi

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.
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