Solar Wanderer is a browser-based 1:1 real-time solar system explorer powered by NASA JPL ephemerides. Built with Three.js 0.165 and Vite 5, it renders the entire solar system at true scale (0.5m to 1e15 km) using a floating-origin world engine, logarithmic depth buffer, and Keplerian orbital mechanics. Users can seamlessly fly through space, walk on planetary surfaces (including real DEM terrain for Earth, Moon, Mars), dive into Earth's oceans, or orbit from a Google Earth-style camera. The application includes a bilingual (Chinese/English) interface with 7-language i18n, search, guided tours, educational facts with NASA sources, mobile touch controls, and shareable URLs. All ephemeris data—planets, 21 moons, 28 TNOs, 4 comets, and ~5400 small bodies—is generated offline via scripts that fetch from NASA JPL and fitted to Horizons state vectors. The architecture is a client-only SPA with modular ES modules; no backend, no registration, no cookies. The codebase demonstrates high craftsmanship in its floating-origin precision, pure-function ephemeris, procedural terrain generation, and real-time atmosphere scattering, though it carries technical debt from a monolithic main.js and incomplete i18n for half its languages.