To explore the effects of the changes in the positions of objects of the solar system on the occurrence of a major earthquake, the authors analyse the positions characteristics of the objects and the tide raising forces which changed when the major earthquakes of above magnitide 7 occurred in China from 1900 to 1996. The analysis results show that the particular positions of the objects of the solar system definitely take some effects on the occurrence of earthquakes and among the ten objects of the solar system, the change in the moon has the greatest effect on an earthquake. 71% of the magor earthquakes of this century occurred during the change in the inclination between the celestial equator and the moon's path from the maximum to the minimum. The analysis of the tide raising forces also demonstrate the horizontal forces trigger the major earthquakes much more easily, which is inaccordance with that the zeniths of the ten objects are concentratively distributed between 40°and 140°. The preliminary discussion given in this paper shows that the tidal acceleration of the objects trigger an earthquake not by a certain value but by the amount of the change in the value.
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