The precession ( ayana ) is not accounted for in the nirayana system ( without ayana ) , which thus dates the actual samkranti correctly but identifies it wrongly with the equinox or solstice , and the sayana system ( with ayana ) , which thus dates the equinox and solstice correctly but identifies it wrongly with the samkranti 运动（阿雅拿）并不包括在尼拉雅拿体系里面（没有阿雅拿） ，因此实际上是准确地注明太阳的运行，但不正当地与昼夜平分点或至点看作一样；赛雅拿体系（没有阿雅拿）准备地注明了昼夜平分点和至日，但不正当地与太阳看作一样。
