Kepler's Laws of Planetary Motion

January 2020

In this article, we will be going through some of the basic concepts required to understand Kepler’s laws.

Angular Displacement and Velocity #

Angular Displacement #

Just as displacement is defined as the change in position of an object, angular displacement is defined as the angle swept by an object travelling in a circular path.

Let’s look at an example. Say, an object travels from point $A$ to point $B$. In this process, say it covers an angle of $\theta$ (see Fig. 1)