Mô hình Chuyển động Hành tinh

This model initially originates from a school project with the goal of simulating the planetary loops (apparent retrograde motion) which appear when Earth overtakes Mars. 

Required material:

• 28BYJ-48 Stepper motor
• Arduino (Nano)
• 2x 608 ball bearings (22 mm x 7 mm)
• ca. 450 4,5mm BBs, in my model steel ones are used
• LM8UU Linear bearing
• Several screws M3/M4
• 8mm x min. 350mm Steel rod

As a building instruction, I recommend using the CAD file because there are all the different parts (except the two planets) in the right place.