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We study the Earth's electric field monitored at PYR (Greece) monitoringsite, for a period of more than six years (May 23rd, 2003 to September 7th,2009). It is compared, in particular its oscillating component of T = 365 days,with the Perihelion - Aphelion dates of the Earth's orbit around the Sun, withthe same component of the Earth's magnetic field, with the corresponding sameperiod tidal oscillation and with the occurred large EQs of the same period oftime. The obtained results suggest that the oscillating electric fieldcomponent is generated by large scale piezoelectricity triggered by the Earth'sshape - lithospheric oscillating deformation. The driving mechanism (yearlytidal variation) precedes the Aphelion - Perihelion dates for a month complyingwith the corresponding tidal friction behavior of the Earth's shapedeformation. The Earth's oscillating electric field peaks coincide with thePerihelion - Aphelion dates while the triggered large EQs are clustered veryclose to the Perihelion - Aphelion dates. Moreover it is shown that theobserved Earth's oscillating electric field is not related to or induced by thecorresponding Earth's magnetic field. In conclusion, the Earth's oscillatingelectric field character could be used as medium to long term electric seismicprecursor of large EQs.  Keywords: tidal waves, Earth deformation, preseismic electric signals,magnetic field, Perihelion, Aphelion, earthquake prediction.

Medium - long term earthquake prediction by the use of the oscillating  electric field (T = 365 days) generated due to Earth's orbit around the Sun  and due to its consequent oscillating lithospheric deformation