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If this angle, which corresponds to a small shift in apparent position on the celestial sphere because of the differing vantage points as the Earth moves around its orbit, can be measured accurately, the distance can then be determined from simple trigonometry.Limitations on Parallax MeasurementsUnfortunately, the parallax angle is very small because of the great distances to stars. Thus, only for the more nearby stars can it be measured reliably. Roughly speaking, ground-based telescopes can only measure parallax reliably for stars that are within a few hundred light years from us (the light year is defined below). Telescopes above the atomosphere such as the Hubble Telescope can measure smaller parallax shifts and thus larger distance, but even in that case the most distant objects for which distance can be determined by parallax of a few thousand light years away.For more distant objects the parallax is simply too small to measure and we must turn to other less direct methods to determine distance.
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I have attach the image for you
parallax is a phhenomenon of changig the object position compared to its respectfull background
take a pen precisely 10 cm from your eye then observe the position of your object with respect to the background
close your right eye and the observe the object
close your right eye then observe your  object
now the apperrent shift of the object with recpect to its back ground is called parallax  method see in the image

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