अष्टशताङ्गुलं धनुः पथिप्राकारमानं पौरुषं चाग्निचित्यानाम् ॥ कZ_०२.२०.१९ ॥
aṣṭaśatāṅgulaṃ dhanuḥ pathiprākāramānaṃ pauruṣaṃ cāgnicityānām
dhanu は 800 aṅgula であり、道路(pathi)と城壁・囲い(prākāra)の標準尺度で、また火壇構築(agnicityā)における pauruṣa の基準でもある。
They enable consistent planning and auditing of macro-projects (roads, walls), where small-unit counting would be slow and easier to manipulate.