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HorizonSensible horizonSkylineVisible horizonAberration of lightAtmospheric refractionLight coneGravitational redshiftAberrationPhase angleAngle of incidenceSpecial relativityMirageGravitational time dilationLight echoParticle horizonGravitational lensSchwarzschild geodesicsRelativistic doppler effectVisual angleAxial tiltCaustic curveMirage of astronomical objectsRelativistic aberrationGravitational fieldPhase functionCritical angleSphere of influenceApparent brightnessPlane of incidenceOptical flowNegative refractionLength contractionElectromagnetic radiationMagnetosphereSurface of revolutionEquatorial bulgeHubble diagramOptical aberrationRadius vectorLight pillarTransverse waveInterference patternDiffuse reflectionCircular motionGravityRefractionHour angleMotionAstrophysicsEclipseRelativistic mechanicsElliptical polarizationSurface brightnessSubsurface scatteringGravitational waveBlack hole cosmologyTransverse modePhysical opticsLine of sightDiurnal motionHawking radiationQuadratureGravitational lensingRadiant energyRadiation zoneBlack drop effectGravitational lensing formalismRest frameRedshiftRelativistic beamingGalactic coordinate systemOrbitTwilightPolarizationHubble lawRetrograde and prograde motionReflectionSolar gravitational lensExpansion of the universeHeliosphereCircularly polarized lightFocusLine of forceEmission nebulaDiffraction gratingSkylightEvent horizonOrbital angular momentum of lightPlane of polarizationInfinity mirrorLinear polarizationRed shiftGravitational radiationRaman scatteringSidereal timeRadianceGravitational singularityBraneHuygens' principle