As a part of MICA, the Meta-Institute of Computational Astrophysics, I will be giving a public talk tomorrow morning entitled "Understanding Relativity with SpaceTime Diagrams".
Einstein's theory of Relativity completely changed our notions of reality in the early 20th century. Time, it turns out, is not absolute, but rather mixes with space in a particular way that depends on how fast a clock (or other time measuring device) is moving relative to whoever is asking questions about it. Spacetime diagrams are a great tool for understanding Special Relativity. In this talk I'll introduce a few of the startling results of Special Relativity, and show how they can be described using spacetime diagrams. In next week's talk (September 17), we'll use SpaceTime diagrams as a tool to help us describe the geometry near black holes.