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The Subject: line speaks of the north pole, which is
related to concept #1. But we can segue to concept #2
now if you want....
Yes, but that's almost trivial to observe. Just watch the motion
of the sun across the sky and keep track of its position relative
to the fixed stars. This defines the ecliptic. Note that the
ecliptic (concept #2) is defined without reference to the north
pole (concept #1).
It is observed that the precession of the ecliptic (#2) is
very slow compared to the precession of the equator (#1).