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Warp schrieb:
>
> I don't think that the curvature of Earth played a significant role in
> the distances involved (probably like a thousand kilometers at most,
> relatively close to the equator).
Indeed. I guess they'd have "re-calibrated" the cart daily whenever
possible. Sunrise or sunset would have been a good opportunity. So the
device would have had to work for typical distances of, say, some 100
km: Two days' travel for a human (I don't think a traveling band would
have had the luxury of a cart ride for all at that time), allowing for
an occasional day good enough for traveling but too bad to get a vector
to the morning or evening sun and no chance of asking any locals where
exactly south might be.
And the precision required would have been quite a deal lower than for,
say, finding Baker Street 22a after having made so many U-turns - all
they needed was a rough vector to the next village.
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