The Earth moves about 30km per second from left to right on the screen. Eastern Asia looks to the upper stream of meteor particle flow again. Leonids radiant and the Earth from space. It's radiant is different position to be seen from the Earth. Because the Earth moves about 30km per second around the Sun.
Number is years from start.
Comets are made by ice and particles of rock material. When comets come close to the Sun, ice melt and particles are discharged. If those particles flow into the Earth's atmosphere, they become meteor. The particle's discharge speed is one thousandth of the comet's orbital speed. On this simulation, we set the particle's speed 12m per second.