一晝夜為十二時。四夜為戍亥子丑，八晝為由寅至酉。故寅刻為夜陰晝陽和合之時。見秘藏記鈔二。
The four hours of the night 戍亥子丑, i. e. 7 to 3, and the eight hours of the day from 寅 to 酉 3 a. m. to 7 p. m.
一四夜八晝 一晝夜凡有子、丑、寅、卯、辰、巳、午、未、申、酉、戌、亥等十二時辰。四夜係指戌、亥、子、丑等四時，八晝則指寅時至酉時之八時。故知寅時為夜陰與晝陽和合之時。〔祕藏記鈔卷二〕p2211