How do pyrotechnicians control the timing so that the firework doesn't explode until it is 500 feet in the sky?

Pyrotechnicians use a combination of fuse lengths and electronic ignition systems to control the timing of a firework’s explosion. They calculate the burn rate of the fuse, which allows them to determine how long it takes for the firework to reach a certain altitude before detonating. By adjusting the fuse length or programming the electronic ignition, they ensure that the firework reaches approximately 500 feet before the charge ignites and explodes. This precise timing is crucial for safety and visual effect.