Create this fill with three shapes

[gwpriester]

OK.

1. I created a circle with a 4px outline, no fill. I converted the circle to shapes separated the circle in the center so that I had two arcs.
2. I added a 4px line in the center and added a point in the center.The two arcs and the line were converted to shapes.
3. I applied a circular fill changing the outside colors so that one fill was lighter in the center and the bottom one darker in the center. The inside colors and the line/shape are all 50% black.
4. The line/shape also had a circular fill but both inside and out were 50% black.
5. I blended the top arc to the line/shape, and then the bottom arc to the line shape.
6. Then I increased the number of blend steps to create a smooth shape.

[handrawn]

blending - I thought so as soon as I saw those markings and the fading along the circumference either side of the 'equator' ends - but not sure exactly how you had put it together

nicely done