The parameters calculation model of a six-screen intersection with linear motion is used to test the projectile explosion location parameter under the condition of long-range artillery firing. which brings a significant test error. the main reason for the error is that the projectile has its own gravity during the flight. it makes the flight path of the projectile is a curved trajectory. https://www.alarecre.com/NHL-Dallas-Stars-Black-Background-iPhone-13-Pro-Max-MagSafe-Case-p96318/