# Orbit precession

1. Sep 9, 2014

### alejandrito29

the problem says:

"consider a particle with orbit

$r(\phi)=\frac{r_0}{1-\epsilon \cos (\beta \phi)}$

$\epsilon \in ]0,1[$ and $\beta=cte$

a) Find the precession angle.

b) What is the condition to the trayectory is totally cyclic??
__________________

I dont understand why i calculare the precession angle. If I draw $r(\phi)$ i view that the grraphics precesse for $\beta \in ]1,2[$, but i need calculate the angle.

the answer of b) is $\beta=integer$????

Last edited: Sep 9, 2014
2. Sep 9, 2014

### BvU

c being the speed of light, e= 2.71828182846, t being time?
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