Distances to nearby stars can be determined from Stellar parallax. <span>Astronomers can measure a star's </span>position<span> once, and then again 6 months later and calculate the apparent change in </span>position<span>. The star's apparent motion is called stellar parallax. The distance d is measured in </span>parsecs<span> and the parallax angle p is measured in </span>arcseconds<span>.</span>
