The 12 Officers Method of date selection relies on the alignment of ‘Month Commander’ (月令) to commence ‘Build’ or ‘Establish’ Day (建) date and sequentially allocates the rest of the officers to each dates. Example: June (午令) uses Horse (午) to commence Build or Establish Day (建).
立春：正月寅日起建，February
惊蛰：二月卯日起建，March
清明：三月辰日起建，April
立夏：四月巳日起建，May
芒种：五月午日起建，June
小暑：六月未日起建，July
立秋：七月申日起建，August
白露：八月酉日起建，September
寒露：九月戌日起建，October
立冬：十月亥日起建，November
大雪：十一月子日起建，December
小寒：十二月丑日起建。January
12 Day Officers Sequence to plot:
建、除、满、平、定、执、
破、危、成、收、开、闭
There are 365 days in a year but 12 day officers, there will be 5 days that are misaligned. As such, some Build or Establish Day may not align nicely when crossing a new season or new month. How do we deal with those as practitioner?
Answer: Using Zhi Run (置闰) method, during each crossing of new season (节气), just need to repeat the previous officer 1x and the start of the new officer will be nicely aligned with the month commander (月令)
The Luminary 
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