| 单词 | 圆周上 |
| 释义 | 〔epicycle〕In Ptolemaic cosmology, a small circle, the center of which moves on the circumference of a larger circle at whose center is Earth and the circumference of which describes the orbit of one of the planets around Earth.本轮：在托勒密宇宙论中的一个小的圆周，其中心在以地球为中心的一个更大的圆周上运动，其轨迹为环绕地球运行的行星的轨道〔center〕A point equidistant from all points on the circumference of a circle or on the surface of a sphere.圆心，球心：与一圆周上或一球面上所有点等距的一点〔azimuth〕The horizontal angular distance from a reference direction, usually the northern point of the horizon, to the point where a vertical circle through a celestial body intersects the horizon, usually measured clockwise. Sometimes the southern point is used as the reference direction, and the measurement is made clockwise through 360°.方位角，方位：从某一参考方向测量的地平线的角距离，通常指从地平线北端到通过天体和地平线相交的垂直的圆周上的某一点，一般顺时针测量。有时南部的点作为参考方向，以360°为标准做顺时针测量〔point〕Any of the 32 equal divisions marked at the circumference of a mariner's compass card that indicate direction.罗盘上三十二个方位之一：用来指示方向的水手罗经刻度盘圆周上标记的三十二等分中之一 |
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