bing-yin day pillar

Wood feeds fire, and 寅 is a wood branch under yang fire. The twelve stages agree with the feeding relation for once, because 丙 begins its count at Growth right here. 三命通會 卷二 is confident about the placement: 丙火生于寅，其理甚明, 丙 fire is born at 寅 and the reasoning is very clear. Its picture is of fire concealed among wood and stone until someone draws it out.

Inside 寅 the handbooks place 甲, 丙 and 戊. For this day stem that makes 甲 Indirect Resource, the inner 丙 a Friend, and 戊 Eating God, the earth that fire gives rise to. The works broadly agree on these three, with 三命通會 writing 艮土, earth of the 艮 direction, for 戊, and they differ on timing: 三命通會 gives 甲 twenty days of the month, whereas 滴天髓 allots seven days each to 戊 and 丙 and leaves 甲 the rest.

爐中火, Fire in the Furnace, is the 納音 held jointly with 丁卯. 三命通會 卷一 narrows it to 炉炭, furnace charcoal, and says 喜冬及木: winter and wood please it. Wood as fuel is easy enough to follow, and the book leaves winter unexplained.