Post BALqV8qxWjFYXwjHuK by Bungler@cawfee.club
 (DIR) More posts by Bungler@cawfee.club
 (DIR) Post #BALqV8qxWjFYXwjHuK by Bungler@cawfee.club
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       Norwood Russel Hanson, "The Mathematical Power of Epicyclical Astronomy" (1960). I hadn't realized you could approximate triangles and squares using epicycle & deferent.
       
 (DIR) Post #BAMMlsqHVOfcLURIki by grips@cawfee.club
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       @Bungler yes, I remember some spirograph combinations that almost resulted in a square