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Argument of periapsisLongitudeEquatorial coordinate systemOrbital inclinationArgument of latitudeEcliptic coordinate systemLunar orbitSolar longitudeOrbit determinationElongationTrue anomalyOrbital periodParallactic angleOrbitOrbital nodeLatitudeNodal precessionSidereal timePhase angleEccentric anomalyMeridianAxial tiltRight ascensionDeclinationLongitude of the periapsisEarth radiusOrbital elementsSidereal yearMeridian altitudeCelestial equatorGeographic coordinate systemHighly elliptical orbitPosition angleCircular orbitPlanetary massAstrometrySurface gravityPoles of astronomical bodiesGeocentric orbitAstronomical nutationSynodic dayLunar nodeSolar timeOrbital inclination changeInclined orbitCelestial mechanicsApparent magnitudeSpherical astronomyMean anomalyLight curveResonant trans-neptunian objectHorseshoe orbitHorizontal coordinate systemHour angleSelenographic coordinate systemEpochOsculating orbitCelestial sphereApsidal precessionQuadratureTwo-line element setBarycenterCelestial navigationAstronomical objectPoints of the compassNodal periodHigh earth orbitMeridian arcGeostationary transfer orbitPlanetary coordinate systemSolar azimuth angleMagnetic dipEarth's rotationPerihelionKepler orbitHalo orbitOrbital station-keepingLuminosity distanceBarycentric julian dateHeliocentric orbitOrbital spaceflightPlanetIntercept methodLight-secondPlanet symbolsAbsolute magnitudeInclinationEquatorial bulgePolar motionNew moonGammaCompassAstronomical unitAzimuthApogeeSphere of influenceEclipticAscendantStellar rotationGalactic center