Spacetime curvature is in turn created by concentrations of matter. For example, the Sun curves spacetime in the vicinity of the Solar System and the elliptical orbits of the Planets are geodesics…. The predictions of the detailed mathematical theory of General Relativity reproduce those of Newtonian gravity in the large separation limit.
The first significant test of General Relativity was resolving a small discrepancy in the orbit of Mercury, the innermost planet, for which the relativistic corrections to the Newtonian orbit are largest.
COSMOS to HUMANITY, Spring 2008
Lecture 2 , slide 5