《明史·志·卷十一》
推算每日夜半中星：将推算到的每日夜半赤道宿度，加半周天，就是夜半中星积度。
推每日夜半中星置推到每日夜半赤道宿度，加半周天，即夜半中唾积度。
Deduce the star in the middle of every midnight: add half a week to the equatorial station degree deduced at midnight every day, which is the middle star accumulation at midnight.