Implement a Geographic Distance Calculator Using TypeScript

A geographic calculation system was developed for Flagle Explorer, an educational flag-guessing game. The system accurately calculates distances and bearings between global points using the Haversine formula and complex angular mathematics. Key features include normalized proximity scoring, real-time performance, and user-friendly directional indicators. The implementation handles various edge cases and has been thoroughly tested. In production, it processes thousands of calculations daily with high accuracy and sub-5ms response times. Future improvements may include WebAssembly implementation and terrain elevation data integration.