This is a nice educational tool to visualize the orbital elements of a
binary. Type plotbinary, and this widget will be created.
The slider values are initially set to the orbital elements contained in
whatever model file you have read before (in our case its Mizar's).
Orbital period and epoch are not included since they do not change the shape
of the orbit.
The solid line indicates the periastron; the dotted line is the line of nodes.