Theory Part II
Published 22 min read August 16, 2026

Simultaneity Without Contraction

Plain language summary

This part derives a new account of simultaneity — the question of whether two events happen "at the same time" — from the postulates alone, without requiring that moving objects physically shrink. The mathematics is developed step by step.

Prerequisites: Part I, basic calculus, Lorentz transformation (familiarity sufficient)
Two events happen simultaneously in one frame. Do they happen simultaneously in another? Einstein said no. This part examines what the postulates actually require — and finds a different answer.
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