**Sub-Category:**

Mechanics / Electrodynamics

**Date Published:**

November 30, 2017

**Keywords:**

angular momentum, centrifugal, gravitational, Kepler, NASA, orbit, planet, planetary orbit, vis-viva equation;

**Abstract:**

In this essay I show how one can use easy maths to analyse planetary orbits, which are elliptical. I also present an example of how one can use “the NASA method” to calculate planetary orbits, based on information in an interesting NASA document.

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