Relativity Relativity Special Relativity Events vs Instants Derivations From First Principles Geometric Approach to Relativity of Simultaneity and the Lorentz Transformation From Speed of Light One-way speed of light From Electromagnetism Contraction vs Dilation Proper Acceleration Puzzles and Paradoxes The Ladder Paradox Twin Paradox Acceleration Spacetime diagrams from POV of both twins in the finite acceleration versions of the twin “paradox”. Ehrenfest Paradox Ball&Fence “Paradox” Graphical Simulation Dynamics General Relativity Gravity On the Approach to a Black Hole Part 2 Evolution to Black Hole of a Large Gas Ball Lemma 2 – Red Shift Gradient Inside a Gas Ball Part I – Falling onto the event horizon Lemma 1- red shift gradient for a point mass