Success in his theoretical work was sealed in 1915. The new equations of gravitation had an essential logical simplicity, despite their unfamiliar mathematical form. To describe the action of gravity, the equations showed how the presence of matter warped the very framework of space and time. This warping would determine how an object moved. Einstein tested his theory by correctly calculating a small discrepancy in the motion of the planet Mercury, a discrepancy that astronomers had long been at a loss to explain. Einstein predicted a specific amount of deflection, and the prediction spurred British astronomers to try to observe a total eclipse in May 1919. After the success of his theories and the actions of the universe (the eclipse) confirmed they were correct, he became an international star of sorts. The defeat and rejection he had received while trying to obtain a teaching position, were no more.