# Relativitaetstheorie: 1911-1914: Entwurftheorie

Einstein-Besso Manuscript

Berlin and Görz, 1913/14, reproduction

Searching for evidence to support his new understanding of gravitation and his *Entwurf* Theory, Einstein encounters the problem of the rotation of Mercury’s orbit, which is not explained by Newtonian theory. Together with his friend Besso, he calculates this motion, known as perihelion rotation

. Although the result does not match with astronomic observations, he holds fast to the *Entwurf* Theory. In late 1915, this calculation becomes a prerequisite for the efficient demonstration that his new theory corresponds with astronomic results.

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