This is a complete overhaul of my interactive celestial map, featuring many improvements. It now uses HTML5 canvas instead of SVG, and that alone makes the rendering of the map much faster, so that the zoom/pan behavior is much smoother now.
Also new is that most of the parameters can be changed live via the form on the demo page, with the resulting change immediately visible on the map. Among many other things it now is possible to do this:
Interactive behavior is still fully intact, so try playing around with it. Check out the documentation in the GitHub repository.