For someone moving past you events physically in front of them happen earlier than they should (according to you), and events physically behind them happen later (according to you). That is, all physical laws are exactly the same whether you’re moving (at a constant speed) or not. So, time dilation, length contraction, and the rearrangement of events are just three sides of the same weirdly shaped coin. : Mathematically, the way a physicist might describe length contraction (more exactly) would be to use the “spacetime interval“. When the front of the object passes the measuring point, and when the back of the object passes the measuring point.