I wrote a much less complete/polished program like this using WebGL this year:

https://wioux.github.io/tracking-station/

I was playing a lot of Kerbal Space Program and wanted to use those UI concepts to explore real missions and orbital maneuvers. I was particularly interested in the Cassini trajectory. But I started the project before discovering Eyes on the Solar System, which is awesome and now I find I'm kind of robbed of my motivation.

I love NASA's work but I find it's websites are very messy and without a decent standard framework or layout. I really wish someone go to a GOV.UK job on them and get some decent standardisation going with them.

There are some standards for NASA websites, but I think they have more to do with responsibility for content and other bureaucratic matters than design concerns. The group I used to be with, the Scientific Visualization Studio, at svs.gsfc.nasa.gov has a pretty decent website, in my biased opinion.