《史记·八书·天官书》
辰星出东方，太白星出西方；或者辰星出西方，太白星出东方，都称为格，预示郊外有兵而没有战斗。
出东方，太白出西方；若出西方，太白出东方，为格，野虽有兵不战。
The morning star appears in the east, and Venus appears in the west; or the morning star appears in the west, and Venus appears in the east, all called grid, indicating that there are troops in the suburbs but no fighting.