《明史·志·卷十一》
又看冬至夏至后的度数，在气象限以下的就是初限，以上的减去半岁周，余数就是末限。
又视二至后度分，在气象限已下为初限，已上用减半岁周，余为末限。
Also check the degrees after the winter solstice and summer solstice, those below the equatorial quadrant are the initial limits. Those above minus the half-year cycle, and the remainder is the final limit.