# Can Kepler's laws apply for circular motions?

Can Kepler's laws apply for circular motions? (First law states planets take an elliptical orbit)

• a circle is an ellipse. – Trebor Aug 21 '18 at 4:28

The circle (eccentricity $\epsilon = 0$) and the ellipse ($0<\epsilon <1$) are two of the four conic sections; the others being the parabola ($\epsilon = 1$) and the hyperbola ($\epsilon >1$).