Orbits And Celestial Mechanics 1-24
24 entries in the Orbits And Celestial Mechanics compendium.
Earth's orbitEarth's elliptical orbit around the Sun defines the year and seasons.Eclipse cycleIntervals after which eclipses repeat under similar conditions.EclipticApparent path of the Sun on the celestial sphere.Equatorial coordinate systemA geocentric system for locating celestial objects.EquinoxTwice-yearly moment when day and night are nearly equal worldwide.Equinox (celestial coordinates)A direction in space, not a moment in time.Escape velocityMinimum speed to escape a body's gravitational pull.Frozen orbitAn orbit minimizing perturbations for long-term stability.Geostationary orbitA fixed point in the sky for global communications and observation.Geosynchronous orbitAn Earth orbit synchronized with the planet's rotation.Graveyard orbitA disposal orbit for end-of-life satellites to reduce debris.Halo orbitPeriodic, non-planar orbit around Lagrange points.Hohmann transfer orbitAn orbital maneuver using two burns to transfer between orbits.Horseshoe orbitA co-orbital motion tracing a horseshoe shape relative to a larger body.LibrationCyclic variation in Moon's apparent position revealing extra lunar surface.Lissajous orbitQuasi-periodic orbit around Lagrangian points used by spacecraft.Molniya orbitA high-latitude satellite orbit with long dwell time over the north.Orbit of the MoonThe Moon's orbit is a stable, complex path studied by lunar theory.Orbital eccentricityParameter measuring deviation of an orbit from a perfect circle.Orbital elementsParameters that uniquely identify a specific orbit.Orbital inclinationAngle measuring tilt of an orbit relative to a reference plane.Orbital periodTime for one full orbit around a primary body.Orbital resonanceOrbital resonance shapes planetary systems through periodic gravitational interactions.Orbital station-keepingKeeping spacecraft in orbit through precise thruster maneuvers.
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