《明史·志·卷十一》
推算赤道加时定积度及宿次：取黄道加时定积度，在周天一象限以下为至后，一彖限以上减去为分后，满两象限碱去为至后，满三象限碱去为分后。
推赤道加时积度及宿次置黄道加时定积度，在周天象限已下为至后，已上去之为分后，满两象限去之为至后，满三象限去之为分后。
Calculation of the accumulated fixed degree and the number of days in the equator: Take the fixed accumulation of the ecliptic, subtract it from the upper limit of the week for the postfix, and subtract the upper limit for the two full quadrants. The postfix for the three full quadrants is subtracted.