Coordinate Dependent Statements in an Expanding Universe

In this Insight we will discuss the general Friedmann--Lemaitre--Robertson--Walker…

Relativity Variables: Velocity, Doppler-Bondi k, and Rapidity

Traditional presentations of special relativity place emphasis…

Relativity on Rotated Graph Paper

This Insight is a follow up to my earlier tutorial Insight (Spacetime…

Spacetime Diagrams of Light Clocks

We demonstrate a method for constructing spacetime diagrams for…