Minor axis

The minor axis of a ellipse is the shorter of its two axis and contains the foci of the ellipsis.

An ellipsis with the equation of the form $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ , where $a>b$ has its major axis on the y-axis. Similarly, when $a<b$ , the major axis is on the x-axis.