Professional-grade resources for space enthusiasts, educators, researchers, and industry professionals. Explore orbital mechanics, time systems, and astronomical calculations through powerful, interactive tools—completely free. Planning to observe? Start with the Tonight's Sky stargazing planner to see what's visible right now.
Personalized stargazing planner. Tells you which planets are up tonight, when they rise/transit/set, moon phase and interference, conjunctions this week, and whether it's worth pointing a telescope outside given your local weather and Bortle sky class.
Interactive map and local-time calculator for the August 12, 2026 total solar eclipse. See the path of totality, shaded coverage everywhere, and the Moon's shadow gliding across the map. Click anywhere or use your location for exact contact times, obscuration and Sun altitude — plus per-city pages, an eye-safety guide, exposure calculator and live countdown.
Interactive 3D Earth-Moon visualizer with ECI, rotating synodic, and Moon-centred frames. NRHO and DRO presets, Lagrange points, lunar surface sites, and live cislunar tracking.
Interactive 3D WebGL application for satellite tracking and trajectory planning. Visualize orbits using TLE data, classical elements, or state vectors in real-time.
Convert between Unix timestamps, Julian dates, Modified Julian dates, and calendar dates. Essential for astronomical calculations and satellite tracking operations.
Parse and analyze Two-Line Element (TLE) data sets for satellites and space objects. Extract orbital parameters including inclination, eccentricity, and mean motion.
Convert between astronomical coordinate systems including Equatorial (RA/Dec), Horizontal (Alt/Az), Ecliptic, and Galactic coordinates. Essential for observation planning and celestial navigation.