@acegikmo I think quaternians are fun, they also make my head hurt. Long time ago I made a earth and sun 3d model. The earth rotated on its axis and orbited the Sun. The viewer could start on the surface and see date and time appropriate light/shadows. Could rise up and still traverse a virtual shell of the surface or change to a view from the elliptic and traverse a shell around the orbiting and spinning earth.
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