  The inner structure of the earth is still a topic of discussion. Seismic
measurements showed a structure of solid, liquid, solid which describes the
mantle, outer core and inner core with the inner core in the center. The
analysis of waveform doublets suggests now that the inner core is out of center
and even of faster rotation than the mantel and crust. From the sum of Buoyancy
and Gravity on the earth inner core, the position energy is plotted and
together with the tangential tidal acceleration, it is derived that Earth Inner
Core cannot be in a center position without additional force. The Earth Core
System is explained as Hydrodynamic Bearing. The tidal acceleration is
identified as the reason for the periodic motion of the inner core and certain
frequencies of nutation. The Eccentricities out of nutation due to the effects
from the sun and moon are calculated as an approximation.
