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Download the 4 sprites and 3 scripts of "planetary_model_Ptol…" and open it in Scratch Project Notes
The planet revolves around the center of the epicycle which in turn revolves around the center of the larger circle. The witch draws the epicycle of radius (R) and the planet a circle of radius (r1).
Click on the green flag to start.
Stop and change the values of radius R and r1 with the sliders. Then, green flag to start.
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mezmorizing! those sliders are fun!
Very beautiful!
Thanks for encouragement.