I haven’t made any progress other than realizing that I’ve been plotting satellites wrong. Altitude and Azimuth is relative to the latitude and longitude of the receiver and I’ve been plotting it relative to the North Pole. It looks kinda cool, but it’s wrong. My interest isn’t there to correct it.
In back of my mind is the project that got me playing with processing in the first place. I want to use an IMU running on a Pico to point at a star, press a button and record the altitude and time. Do this with 3 different stars and calculate a fix and determine the amount of error. Basically, it would be an electronic astrolabe. Half a century ago I had a course in Astronomy and for a lab we used an astrolabe made from a yard stick to observe some stars and calculate our position. It was fun to be out on a crisp fall evening, but error prone. Obviously, that lab exercise stuck in my head and distracts from any other project until I do it.