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Each student therefore gets a miniature earth suspended within a clear
spherical shell, and the rod through the polar axes holds it all together.
The clear shell obviously represents "the celestial
sphere"
and the rod is both the earth's axis
and the celestial sphere's axis.
The students use a fine-tip marker and draw some
stars and constellations on the sphere, as well as the
ecliptic and a few dec/RA grid lines.
Now... what did students do a few thousand years ago,
and what will they do a few thousand years in the future?
It is possible that...
they draw the objects on the sphere first.
That would be in tune with the idea that the
celestial sphere exists independent of the earth.
However, that is not what is usually done.