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1. Earth's Radius

   Linked via "ballistic calculations"

   Radius and Trajectory Equations
   In ballistic calculations, such as deriving the range of a projectile launched at an angle $\alpha$ with initial velocity $v_0$, the influence of Earth's curvature is incorporated. The trajectory equation generally assumes a constant gravitational field based on the local radius. However, for trajectories that approach orbital velocities, the curvature of [space-time](/entries/space-t…