Epicycloid
01
外摆线, 外摆线曲线
a curve created by tracing the path of a point on a small rolling circle as it revolves around the edge of a larger circle
例子
Planetary astronomers once thought the apparent motions of Mars could be explained by a combination of deferents and epicycloids modeled after circular trajectories.
行星天文学家曾认为，火星的视运动可以用基于圆形轨迹建模的均轮和外摆线的组合来解释。
