epicyclic

• 形容词，指与本轮或本轮相关的；历史上用于托勒密天文学，描述中心沿较大圆周运动的小圆周。

An obsolete adjective relating to an epicycle or epicycles; used historically in Ptolemaic astronomy to describe a small circle whose center moves around the circumference of a larger one.

1. C2formaltechnical

   Of or relating to an epicycle, which is a small circle whose center moves along the circumference of a larger circle, used in ancient astronomy to explain planetary motion.

   本轮相关的

   • The epicyclic model was used by Ptolemy to describe the paths of planets.
   • Epicyclic gears are used in some mechanical systems to achieve complex rotations.
   • The ancient astronomers calculated epicyclic orbits to predict celestial movements.

   同义词epicyclical