 
   
 extension JulianDay: CustomStringConvertible {
+    
+    /// The description of the Julian Day.
     public var description: String {
         switch self {
         case StandardEpoch_J2000_0: return "J2000.0"

    
    // MARK: Dynamical Times
    
    public func deltaT() -> Second {
        return Second(KPCAADynamicalTime_DeltaT(self.value))
    }

    public func cumulativeLeapSeconds() -> JulianDay {
        return JulianDay(KPCAADynamicalTime_CumulativeLeapSeconds(self.value))
    }
    
    public func TTtoUTC() -> JulianDay {
        return JulianDay(KPCAADynamicalTime_TT2UTC(self.value))
    }
