public static void main( String[] args ) throws GogException{
GaiaSimuTime x = GogConstants.UM_INITIAL_TIME;
double t = x.getElapsedNanoSecs();
System.out.printf("%20.12e\n", t);
System.out.printf(x.asIsoDate() + "\n");
double yearsSubCatalog = 1.5;
double missionStart = MissingParams.MISSION_START * GaiaParam.Nature.JULIANYEAR_DAY * GaiaParam.Nature.DAY_SECOND * 1e9;
double timeSpan = yearsSubCatalog * GaiaParam.Nature.JULIANYEAR_DAY * GaiaParam.Nature.DAY_SECOND * 1e9;
System.out.printf("%20.10e %20.10e\n", missionStart, missionStart + timeSpan);