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Sidereal yearSidereal timeRotation periodLunar dayOrbital periodDiurnal cycleSun pathDiurnal motionSynchronous orbitLunar calendarSun-synchronous orbitGalactic yearEarth's rotationSolar timeTropical yearEcliptic coordinate systemApsidal precessionOrbitSolar longitudeElongationLunar orbitSolar calendarNodal precessionParallactic angleGeosynchronous orbitAxial tiltHeliocentric orbitGeosynchronous satelliteAstronomical nutationDaytimePeriod-luminosity relationSundialNodal periodPhase angleKepler orbitHour angleEquatorial coordinate systemPoles of astronomical bodiesHeliacal risingOsculating orbitStellar rotationPolar orbitAstrometryAxial precessionArgument of latitudeSpherical astronomyNatural satelliteQuadratureDeclinationMean anomalySurface gravityCircular orbitSolar luminosityHeliocentrismTerrestrial timeIslam and astrologyLight curveAnalemmaGalactic coordinate systemCepheid variablePlanet symbolsEquatorial bulgePlanetary hoursHistory of sundialsNew moonSolar cycleGeocentric orbitLunar new yearMeridianPolar alignmentBarycenterSolsticeEquinoxHorseshoe orbitArgument of periapsisHourOrbital speedEpochGeostationary orbitOrreryProper motionBarycentric julian dateThermal time scalePrecessionSolar systemLongitude of the periapsisMagnetosphereAstronomical objectCulminationMeridian circleTrue anomalyLunar monthAstrariumSouthern celestial hemisphereCelestial equatorSupersynchronous orbitRetrograde and prograde motionNight skySphere of influenceOrbital ring