1. Draw two red concentric circles, and draw two concentric circles in two red concentric circles as auxiliary lines.

2. There are 22 repeated patterns, each of which is 360/22= 16.7 degrees.

3. Draw a central angle of 16.7 degrees, and draw a set of broken line patterns along the auxiliary line circle with the pen tool.

4. Copy and paste the pattern and rotate it by 16.7 degrees.

5. Repeat step 4 until the pattern is completed for one week (it can also be generated by the blending tool).

6. Delete the auxiliary line circle.

7. Rescue