It's all a giant pile of PHP code I wrote ages ago, it's not even map-projection-aware it just plots on a 2D canvas. The animation is basically a timelapse of a bunch of frames of that same script played in a row.
Thanks for the info :D Will probably do something similar when I have more data to create more interesting “maps”.
Or if you don't know what a response
is, you can always write a webmention comment (you don't need to know what that is).