Barnard's Star ~ Images over three year period shows proper motion

This image was taken by NJAA member, Perry Arts:

Attached is a stacked image of Barnard's Star, taken over 3 years. It shows the star's proper motion, 10.4" per year.
The images were taken on:
                  July 4, 2013
                  June 30, 2014
                  Jul 8, 2015
Camera: Celestron Nightscape 8300 OSC
Exposure: 20 seconds, binned 2x2

Thank you Perry...