03-31-2019 22:44 PM
This app represents beautiful trajectory of circular motions of two balls.
You can set period and radius of motion, and you will see the beauty of nature 🙂
for a reference of background mathematics, see http://www.sci-museum.jp/files/pdf/study/research/2011/pb21_029-036.pdf
* I cdnt find English article, above is in Japanese.