epicycle

• Circunferência que rola interna ou externamente sobre outra circunferência, gerando curvas conhecidas como epicicloides ou hipocicloides. Na astronomia antiga ptolomaica, era a circunferência auxiliar cujo centro se move sobre um deferente e cujo movimento explica as irregularidades aparentes dos planetas.

A circle that rolls either inside or outside another circle, generating curves known as epicycloids or hypocycloids.

1. Rolling circleC2formalscientific

   A circle that rolls around the inside or outside of another fixed circle, generating a curve known as an epicycloid or hypocycloid.

   Círculo rolante

   • The path traced by a point on an epicycle is a complex curve.
   • Ancient astronomers used epicycles to explain planetary motion.
   • The gear mechanism relies on the principle of an epicycle.