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ParsecLight-yearAstronomical unitParallax secondLight yearSolar luminosityYearNautical mileMetre per secondKilometreSpeed of lightKilogram-metreKilometres per hourLight-secondSolar constantMeterSolar yearSidereal timeSolar irradianceHubble constantPlanck lengthSurface brightnessOrbital periodExpansion of the universeSidereal yearLumenRecessional velocityMetreStellar dayGalactic coordinate systemRadius vectorKilogram per cubic metreFurlongNanometreLuminosity distanceSolar radiationSchwarzschild radiusApparent brightnessMillimetreCentimeter-gram-secondPlanck forceLuminosity functionMiles per hourPhase angleOrbit of marsOrders of magnitudeHubble timeCoriolis frequencyMetric systemPlanck timeMinute and second of arcFoot per secondRadial velocityAcceleration of gravityMetre per second squaredHectometrePlanck temperatureHeliometerSquare metrePicometreSpecial relativityApparent magnitudePlanck momentumKilogramDioptreSynodic dayMilliradianEnergyEscape velocityAstronomical system of unitsLunar monthGravitational constantHydrogen burningPlanck accelerationGalactic yearRest energyRadian per secondInertial spaceThermal time scaleMileInsolationHourHectareSpecific angular momentumOrbitUniversal timeWavelengthCubic metreCubic metre per secondCosmological redshiftPlanck speedAngstromDerived unitFoot-pound-secondSolar dayVelocity dispersionPlanck energyIntrinsic brightnessBolometric correctionLuminous flux