what are all of the persian units?
finger, hand, foot, four-hands, cubit (five-hands), great cubit (six-hands), pace, ten-foot, hundred-foot, league, the distance a horse could walk in one hour., mansion, one day's march on the royal road.
how long, metrically, are they?
[?] 20 mm, [?] 100 mm, [?] 300 mm, [?] 400 mm, [?] 500 mm, [?] 600 mm, [?] 1.5 m, [?] 3 m, [?] 24 m, [?] 6 km, [?] 24-30 km
and what is the length of just the four-hands unit?
[?] 400 mm