While trying to figure out spheres, spheroids, ellipsoids, and geoids I came across this page: http://earth-info.nga.mil/GandG/geotrans/index.html
It’s the DoD unclassified coordinate transformation tool called GEOTRANS.
I haven’t used it, but hey, another tool is another tool.
The NGA Coordinate Systems Analysis page has some links to other cool tools and reference information.
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