Example image of eyePlorer eyePlorer map for 'Orbit': Physics Deferent and epicycle Johannes Kepler Isaac Newton Newton's law of universal gravitation Philosophiæ Naturalis Principia Mathematica Albert Einstein Geodesic Spacetime Celestial spheres Geocentric model Kepler's laws of planetary motion Circle Ellipse Focus (geometry) Planet Solar System Astronomical unit Eccentricity (mathematics) Eris Pluto Conic section Gravitation List of Solar System objects in hydrostatic equilibrium Center of mass Mass Theory of relativity Comet Dwarf planet Elliptic orbit Planetary system Space debris Star Hyperbolic trajectory Parabolic trajectory Natural satellite Satellite Orbital eccentricity Perturbation (astronomy) Mercury (planet) Epoch (astronomy) Mars Neptune Venus Apsis Velocity Secular variations of the planetary orbits Newton's cannonball Circular orbit Escape velocity