But here a question of concepts arises, behind the numbers; and then, is it worth e.g. spending hours calculating numbers based on a figure geometrically inconsistent?
The drawing of the circle pointed out by Leonardo, plotted with a compass on the navel, as for the hands must be reduced from the point .e[xtrn] to the point i.[ntrn], thus losing its magic tangentiality to the base of the square; hence shortening even more the length of the legs.
But with any of such precision gap, no gear in the machines designed by Leonardo Da Vinci could ever work.The current adjustment from the reliable photo of the original (of Luc Viatour, www.lucnix.be. 2007-09-08), and even the use of bitmap tools may be somewhat critical; but the point is not how much the gauge between the two rays is, but the fact that to join Leonardo's circumference, the arms should be rotated up to the intersection .a, not have to be forced within the square, a choice which does not comply any canon about. Being aware that the "The shoulder joint is capable of movement in every direction, forward, backward, abduction, adduction, circumduction, and rotation", to keep simple our case, after a long search though, I got a useful reference and illustrations from the rich and exhaustive "Normal motions of the shoulder joint" article, which shows how the complex scapulo-humeral joint extension is adducted along an arch when raising the arm to one elevated position pointing to the sky.