$($General Relativity and Planetary Orbits$)$ The relativistic equation for the orbit of a

planet around the sun is described as follows.

$2$

$2+=+2$

Where $=1$

$$ and $,$ are the polar coordinates of the planet in its plane of motion.

The parameter $$ is positive and can be found explicitly from classical Newtonian

mechanics: the term $2$ is Einstein$$s correction. Here $$ is a very small positive

parameter.