अर्धन्यूनश्चान्द्रमासः ॥ कZ_०२.२०.४९ ॥
ardhanyūnaś cāndramāsaḥ
The lunar month (cāndra-māsa) is half a day less (i.e., twenty-nine and a half day-nights).
It gives a computable conversion rule between lunar dating (used in society) and fixed administrative cycles (wages, audits, deadlines).
Administrative rationalization: define uniform units and conversion rules so the state can plan, collect, pay, and adjudicate consistently across time and territory.