Ballistic Trajectory + Kill-Chain Timeline

What it is

Browser-native exterior-ballistics simulator: launch angle, velocity, mass, drag coefficient and caliber in; apogee, ground range, time of flight, terminal velocity and impact angle out - a 3DOF point-mass integration (RK4) through the US Standard Atmosphere 1976 with an optional crosswind, drawn as a side view (range vs altitude) and an overhead view, with a configurable kill-chain timeline (Detection / Track / Engage / Assess) laid over the time-of-flight axis as a Gantt bar chart. Deterministic, entirely client-side, wall-time shown on every run. The drag solution is a numerical model (RK4 + USSA-1976); the drag-off vacuum limit is exact and GeoNum-certified. Standard published exterior-ballistics math.

Honest scope

Authorities cited

• US Standard Atmosphere 1976, NOAA/NASA/USAF (NASA-TM-X-74335). Geopotential layers, base temperature/pressure/lapse-rate, and the barometric density model used here. https://ntrs.nasa.gov/citations/19770009539
• R. L. McCoy, Modern Exterior Ballistics: The Launch and Flight Dynamics of Symmetric Projectiles, 2nd ed., Schiffer 2012. Point-mass and modified point-mass trajectory models and the aerodynamic drag law D = 0.5 rho Cd A v^2.
• C. Runge (1895) and W. Kutta (1901): the classical fourth-order Runge-Kutta method for ordinary differential equations (the RK4 integrator). See e.g. Hairer, Norsett & Wanner, Solving ODEs I, Springer.
• Closed-form vacuum projectile motion (Galilean parabola): range R = v^2 sin(2 theta)/g, apogee H = (v sin theta)^2/2g, time of flight 2 v sin theta/g - the drag-off correctness anchor.