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I would say this is the second time
this topic is discussed in this list...and I thought this
was an already closed question. How naive I was.
Indeed, after reading and re-reading the contributions
of this second attempt, I am no longer sure if my
picture of magnet-earth pair is right.
That's how I fitted these things together:
-for the origin of earth's B field, I imagine, f.i.
a solenoide, located at the earth's center, the current
circulating from London to South Africa.
-The bar magnet has magnetic dipole pointing from its
white end (south) to its red end (north) (suppose no one
has inverted its magnetization, so that red is actually
its north)
-A magnetic moment will always aling (same direction
and orientation) with the B field wherein the former lies.
-The compass we have in our hands lies always outside the
solenoid wich models the Earth's B field.