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• objectDateGoodEnoughForOrbits() : KeplerOrbit
• objectDateValid() : KeplerOrbit
• objectDateValidRange() : KeplerOrbit
• obliquity() : Calendar
• observedLunarAltitude() : Calendar
• OctahedronPolygon() : OctahedronPolygon
• oldHinduLunarFromFixed() : OldHinduLuniSolarCalendar
• olympiadFromJulianYear() : OlympicCalendar
• oneRowTwoCells() : NavStars
• onPropertyChanged() : StelPropertyProxy
• openConstellationDialog() : SkyCultureMaker
• operator*() : Vector2< T >
• operator*=() : Vector2< T >
• operator/() : Vector2< T >
• operator/=() : Vector2< T >
• operator<() : Satellite
• operator=() : gTime , LinearFader , ParabolicFader
• operator==() : SphericalCap , StelOBJ::Vertex
• orthodoxEaster() : GregorianCalendar
• output() : StelMainScriptAPI , StelScriptMgr
• outputHullAreas() : ConstellationMgr