https://orbitspan.vercel.app 2026-08-15 daily 1.0 https://orbitspan.vercel.app/logo.png OrbitSpan — Interactive 3D Solar System, Live Ephemeris & Planetary Scale Explore the Solar System in interactive 3D with live calculated planetary positions (VSOP87 ephemeris), true-scale orbital distances, and real-time gravitational readouts. https://orbitspan.vercel.app/gravity-lab 2026-08-15 weekly 0.9 https://orbitspan.vercel.app/logo.png Gravity Lab — Real-Time Planetary Gravitational Pull Calculator | OrbitSpan Enter your body mass to calculate the real Newtonian gravitational acceleration (a = GM/r²) and force (F = ma) exerted on you by the Sun, Moon, and every planet live. https://orbitspan.vercel.app/human-scale 2026-08-15 weekly 0.9 https://orbitspan.vercel.app/logo.png Human Scale Solar System — Intuitive Cosmic Distances | OrbitSpan Shrink Earth to the size of a marble (1 cm), a golf ball (5 cm), a fist (10 cm), or a basketball (25 cm) to discover where the Moon, Sun, and planets sit at true physical scale. https://orbitspan.vercel.app/learn 2026-08-15 monthly 0.8 https://orbitspan.vercel.app/logo.png Science & Physics of Cosmic Scale & Gravity | OrbitSpan Master the physics of cosmic scale: the inverse-square law, acceleration vs force, planetary ephemerides, tidal forces, and a rigorous scientific evaluation of physics vs astrology. https://orbitspan.vercel.app/sources 2026-08-15 monthly 0.8 https://orbitspan.vercel.app/logo.png Data Sources, Constants & Mathematical Methodology | OrbitSpan Explore the open-source astronomy ephemeris (VSOP87 / Meeus), NASA JPL planetary parameters, CODATA & IAU physical constants, and computational methods powering OrbitSpan.