## Astro 18, UCSC, Fall Quarter 2010

**Animations for Lecture 3**

## Note: Not all of these links are working yet. I will fix them shortly. Claire

**Epicycles**

**Ptolomy's
Model of the Inner Planets (epicycles) - html**

**Eccentricity
of an Ellipse (Nick Strobel) (animated GIF file**)

**Eccentricity
and Semi-Major Axis of an Ellipse (Interactive Java applet)**

**Velocity
needed to go into orbit around the Earth (Interactive Java Applet)**