I was wanting to describe to some folks I am doing a satellite demonstration for next week, about how some satellites have stable sun-synchronous orbits while others process earlier each day. The old DOS program, InstantTrack, that most likely will not work under the Windows 10/64 bit world had a nice display of this behavior, Are there any recommendations for a more modern application that will do the same type of thing? If you are not familiar with what I am talking about, look at page SO-3 in the current "Getting Started." book from AMSAT (As well as on earlier pages) to see what I am looking for. A web search shows that it should be in the AMSAT software archives but the page link for that particular software is broken. It is a nice planning utility, especially for birds that do change times each day.
Tom Schuessler, N5HYP EM12ms