《明史·志·卷一》
春分，戌初二刻五分，黄昏，北河三星为中星；寅正一刻十分，清晨，尾宿为中星。
春分，戌初二刻五分昏，北河三中；寅正一刻一十分旦，尾中。
Spring Equinox, twilight at 25 minutes after 7 pm, North River three stars as the middle stars; 11 minutes and 10 seconds after 3 am, in the early morning hours, after Weisu as the middle star.