Part I - Space-time Geometry

Part II - Optics and Signals


All animations are referenced in the main text, where their context is fully explained. The animations are clearest when you use them as a supplement to the main text, not when you simply view them by themselves, out of context.

Warning: sometimes screens can subtly distort images. For example, the author has seen small but measurable distortions in some angles, when a screen is not using its default resolution.

Animations - Part I:

Animations - Part II:

Other Pages


The author is John O'Hanley. He is a retired computer programmer, and he earned a B.Sc. in Physics from the University of Prince Edward Island (Canada). If you have any corrections, criticisms, or questions about the site, he would be pleased to hear from you.