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Definitions of orbit:

noun:   the (usually elliptical) path described by one celestial body in its revolution about another
Example: "He plotted the orbit of the moon"

noun:   the path of an electron around the nucleus of an atom
noun:   the bony cavity in the skull containing the eyeball
noun:   an area in which something acts or operates or has power or control
Example: "In the political orbit of a world power"

noun:   a particular environment or walk of life
Example: "He's out of my orbit"

verb:   move in an orbit
Example: "The moon orbits around the Earth"

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Alternative Terms
lunar-orbit moon earth star angular-diameter natural-satellite planet ecliptic celestial-sphere rotation semi-major-axis orbital-eccentricity inclination obliquity lunar-precession apsis double-planet apse-line perpendicular lunar-node jacques-cassini cassini-s-laws babylon iraq cuneiform full-moon data-analysis ancient-greece mathematical-model ptolemy epicycle evection newton month equinox lunar-phase sun tide tidal-acceleration gravity coast ocean friction estuary angular-momentum dinosaur synchronous-rotation far-side-of-the-moon libration geographical-pole solar-system orbital-period retrograde-and-direct-motion ernest-william-brown lunar-standstill orbital-elements precession list-of-orbits milankovitch-cycles astrological-age great-year martin-gutzwiller digital-object-identifier terence-dickinson internal-structure-of-the-moon topography-of-the-moon magnetic-field-of-the-moon atmosphere-of-the-moon solar-eclipse-3 lunar-eclipse-2 selenography near-side-of-the-moon lunar-mare impact-crater south-pole-aitken-basin shackleton lunar-ice peak-of-eternal-light space-weathering transient-lunar-phenomenon geology-of-the-moon lunar-geologic-timescale giant-impact-theory lunar-meteorite kreep apollo-lunar-surface-experiments-package late-heavy-bombardment exploration-of-the-moon apollo-program robotic-exploration-of-the-moon colonization-of-the-moon lunar-calendar-2 the-moon-in-mythology lunar-effect orbit box-orbit capture-orbit circular-orbit elliptic-orbit highly-elliptical-orbit

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