sentences:  One saros equaling 18.03 years is not equal to a perfect integer number of lunar orbits (Earth revolutions with respect to the fixed stars of 27.32166 days sidereal month), therefore, even though the relative geometry of the Earth–Sun–Moon system will be nearly identical after a saros, the Moon will be in a slightly different position with respect to the stars for each eclipse in a saros series.The axis of rotation of the Earth–Moon system exhibits a precession period of 18.59992 years.The saros is not an integer number of days, but contains the fraction of of a day.