![]() A parsec is defined as the distance at which an object has a 1-arcsecond stellar parallax. Where D is the actual distance measured in parsecs and p is the observed parallax angle measured in arcseconds. ![]() The parallax of a celestial body can be used to find an approximate distance using the formula These two separated points are situated on the Earth’s orbit and created by two different orbital positions of Earth as described below. Stellar parallax is the difference in direction of a star as seen from two widely separated points. It is measured by the angle or semi-angle between the two lines of sight from an observer to the object. The parallax is the apparent change in the position of an object resulting from a change in the position of the observer.
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