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Federal
Near-Earth Comets - Orbital Elements API
National Aeronautics and Space Administration —
This API uses data from heliocentric ecliptic orbital elements for 170 NECs (Near-Earth Comets) sorted by object number/name. -
Federal
NASA World Wind API
National Aeronautics and Space Administration —
World Wind is a collection of components that interactively display 3D geographic information within Java applications or applets.