Jan G. Otterstrom F.

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CARDINAL POINTS

From China before Christ
the Han Dynasty is known
for invention, lodestone
naturally magnetized iron
could align a needle with
the earth’s magnetic field
soon cleverness spread
to Persia and then Europe
the navigator’s compass
identifies north, meridian
local field exerts torque
points to the Pole, arrow
true and magnetic there
in declination, circled in
360º azimuthal bearings
deviations calculated
precisely, maps oriented
geographically, to know
North, South, East, West
are found, yet inclination
varies with latitudes so
balance care is taken.




© Jan G. Otterstrom F. August 24, 2015