This is the main calculation routine for all planets, asteroids, lunar nodes and apogees. See
swe_calc(...) for more information.
@param tjd_ut The Julian Day number in UT (Universal Time).
@param ipl The body to be calculated. See
SweConst for a list of bodies
@param iflag A flag that contains detailed specification on how the bodyis to be computed. See
SweConst for a list of valid flags (SEFLG_*).
@param xx A double[6] in which the result is returned. See above for moredetails.
@param serr A StringBuffer containing a warning or error message, ifsomething fails.
@return iflag or SweConst.ERR (-1); iflag MAY have changed from inputparameter!
@see SwissEph#swe_calc(double,int,int,double[],java.lang.StringBuffer)