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DistanceDistance measureDiameterDistance functionGreat-circle distanceHaversine formulaOrbitApothemCircular orbitRadiusGreat circlePericenterOrbital nodeCircleSurface areaCircular arcLengthScalePolar circleMajor axisLuminosity distanceParallactic angleConjunctionGeographical distanceTrue vertical depthPoles of astronomical bodiesLunar distanceCelestial equatorAnnulusElongationPoint of tangencyPeriapsisEquatorial coordinate systemCollinearityCircumferenceCentre of curvatureBinary starMidsphereOrbital state vectorsCenter of gravitySpherical angleAngle of elevationEarth radiusOrbit determinationMoon unitRoundnessPerimeterPlane angleAltitudeSlant heightPerpendicularSphericityEquatorIncircleMeridian arcSagittaPerihelionGeodesic curvatureAlternate anglesMidcircleSpherical geometryDouble planetCircumsphereLight equationImpact depthDistance modulusArc lengthInternal and external anglesAngle of reflectionCenterLinear pairEustatic sea levelTrajectoryLine of nodesAngle of refractionParallelSpherical wedgeEarth-centered inertialTangential velocityAspect ratioRight angleChordHorseshoe orbitHour circleAxial tiltCircle of antisimilitudeBinary black holeBinary asteroidEnergy distanceCoplanarityParallelogramAngle of viewReprojection errorClosenessSecantTrilaterationSurface gravityClosing speedCircular sectorOrbital inclination