Download Orbit SIO2USB Interface Computer Driver Update

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orbits in celestial mechanics, due to gravitythumb|300px|The International Space Station orbits Earth once about every 92 minutes, flying at aboutabove sea level. thumb|300px|Two bodies of different masses orbiting a common [[Barycentric coordinates (astronomy)|barycenter. The relative sizes and type of orbit are similar to the Pluto-Charon system.]] In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet. Normally, orbit refers to a regularly repeating trajectory, although it may also refer to a non-repeating trajectory. To a close approximation, planets and satellites follow elliptic orbits, with the center of mass being orbited at a focal point of the ellipse, as described by Kepler's laws of planetary motion. For most situations, orbital motion is adequately approximated by Newtonian mechanics, which explains gravity as a force obeying an inverse-square law. However, Albert Einstein's general theory of relativity, which accounts for gravity as due to curvature of spacetime, with orbits following geodesics, provides a more accurate calculation and understanding of the exact mechanics of orbital motion.