Ah, I love these posts. There's always some gems popping up in the comments. My top 3 are Xaos (previously mentioned above), XEphem (https://github.com/XEphem/

Ah, I love these posts. There's always some gems popping up in the comments. My top 3 are Xaos (previously mentioned above), XEphem (https://github.com/XEphem/XEphem); https://github.com/XEphem/XEphem); an absolutely lovely ephemeris, and predict (https://www.qsl.net/kd2bd/predict.html); https://www.qsl.net/kd2bd/predict.html); the satellite tracker--which has a bunch GUI versions--for example gpredict, which I guess is more relevant for this story.