**Kepler's Machine**

Working model to show Kepler's 1st and 2nd laws and the equivalence of the area law to the law of equants.

**What it shows:**

A demonstration illustrating the equivalence of Kepler's second law, the Law of Areas, with the Law of Angles.

**How it works:**

In order to determine the orbit of Mars using circular orbits, Kepler had to offset the focus of Mars' orbit from the Sun to a point C (*figure* 1). Kepler's 2nd Law of planetary motion states that a planet's orbit around the Sun will sweep out equal areas in equal times....