The amount of shift is quite small , measuring 1 arcsecond for an object at a distance of 1 parsec ( 3.26 light-years ) , thereafter decreasing in angular amount as the reciprocal of the distance .
The amount of shift is quite small , measuring 1 arcsecond for an object at a distance of 1 parsec ( 3.26 light-years ) This method works for distances up to a few hundred parsecs .