Japanese ri = 3926.79936 length
Try converting from "ri" to bottom measure, caliber (gun barrel caliber), cloth finger, cloth quarter, digitus (Roman digitus), earth to moon (mean distance earth to moon), en (typography en), engineers chain, finger, French, furlong (surveyors furlong), gradus (Roman gradus), Greek fathom, Greek palm, hand, inch, league, parasang, pica (typography pica), survey foot, or any combination of units which equate to "length" and represent depth, fl head, height, length, wavelength, or width.
ri = 39,267,993,600,000 angstrom, .08866279 arpentcan, 67.16 arpentlin, 2.62E-08 astronomical unit, 107.36 bolt (of cloth), 17,177.6 cloth quarter, 211,778.63 digitus (Roman digitus), 128.83 engineers chain, 3.93E+18 fermi, 19.52 furlong (surveyors furlong), 2,121.27 Greek fathom, 16,970.19 Greek span, .81333333 league, 19,520 link (surveyors link), 3,926,799,360 micron, 11,172,826.48 point (typography point), 13,267.97 Roman foot, 21.21 stadia (Greek stadia), 21.26 stadium (Roman stadium), 12,883.17 survey foot.
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