› Forums › Deep Sky › Interpreting star charts and images › David,
29 July 2017 at 5:10 pm
#578392
![](https://britastro.org/wp-content/uploads/2016/07/picture-645-1468946374-80x80.jpg)
Participant
David,
I’ve made a quick animated GIF of the two images in your post (I’ve inverted the black and white in the AAVSO plot). There are lots of “differences”. I suspect some may be non-stellar objects. How accurate is the AAVSO chart, how are these charts constructed, and how old are they; might some also be proper motion of stars? Will be interesting to see what others say.