カエサル

This is the part of a Saturn V launch most people skip the seconds before it moves. The five engines don't all light at once. The center one starts first, then the outer ones follow in opposing pairs about 300 milliseconds apart, so the rocket isn't slammed with all that thrust in a single jolt. It stays clamped to the pad while the computers check that every engine is making full power. Only then do the hold-down arms let go. Even the release is gentle. As it starts to rise, tapered pins get dragged through dies on the rocket, and that holds it back for a fraction of a second. What gets me is how long it sits there burning. Roughly seven seconds of engine run time go by before it moves at all.