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HorizonHour angleEcliptic coordinate systemMeridianEquatorial coordinate systemGeographic coordinate systemLatitudeAstronomical coordinate systemsPoints of the compassAxial tiltGalactic coordinate systemParallactic angleCelestial equatorLongitudeMeridian altitudePhase angleDeclinationCircle of latitudePolar alignmentArgument of latitudeSpherical astronomyPoles of astronomical bodiesSolar longitudeMagnetic dipNorthern celestial hemisphereMeridian arcAzimuthSolar azimuth angleSolar zenith angleMagnetic declinationHistory of the compassElongationRight ascensionPosition of the sunSouthern celestial hemisphereSidereal timeSurface gravityPlanetary coordinate systemQuadratureEquatorPosition angleAstrometryHeliocentric orbitHeliocentrismSun pathAnalemmaEarth's rotationCelestial sphereKepler orbitMeridian circleGeostationary orbitDiurnal motionAir massBackstaffTerrestrial timeAtmospheric refractionOrbital inclinationCelestial navigationIntercept methodSolar timeOrbitSundialSun-synchronous orbitCompassSubsolar pointSelenographic coordinate systemApsidal precessionOrbital nodeSynodic dayEarth-centered inertialIers reference meridianAlignmentHoroscopic astrologyEquinoxAstrological aspectEarth's shadowLongitude of the periapsisBarycenterHigh earth orbitHistory of sundialsEquatorial bulgeAxis mundiInclined orbitLocalityCircular orbitSurface brightnessIslam and astrologyLunar orbitSatellite geodesyMariner's astrolabeNight skyCircumpolar starSphere of influenceEclipticAerial perspectiveCulminationPolar motionInclinationDaytimeMollweide projection