Target geometries, Olympic 70M vs Big Shoot, side view. Note that the Big Shoot target geometries given here are as per the target dimensions and unit equivalencies elaborated in Zheng Xuan’s commentaries to the relevant Classics. On Zheng Xuan’s miscalculation of the mid- and long-range target heights (corrected here) and on the idealised nature of his other figures, see Morgan (forthcoming).