Aeon418
The lines that form the figure can't be equal and still fit in a circle.Equal 'sided' unicursal hexagram .... you lost me there ... do you mean the lines that make up the 'outside' of the figure?
I'm going to assume you know the placement of the Sun, Moon, and elements on a uni hex.
Find a picture of a unicursal hexagram traced within a circle. Now measure the length of the line between the top Sun point to one of the two elemental points connected to it.
Now measure the length of the line connecting any of the elemental points. Notice the difference? Because the element to element lines pass through the center of the circle they are equal to the diameter of the circle. The lines that connect the top and bottom points can't possibly be the same length because they don't pass through the center of the circle.