Formula
$$\begin{array}{ll} x =& a \cos t \\ y =& b \sin t \end{array} 0\le t \le 2 \pi$$
Variables
a
→
Semimajor axis
b
→
Semiminor axis
$$\begin{array}{ll} x =& a \cos t \\ y =& b \sin t \end{array} 0\le t \le 2 \pi$$