| 释义 |
天球tiānqiú为研究天体位置和运动,天文学上假想天体分布在以观测者为球心,以适当长度为半径的球面上,这个球面叫做天球。以地心为球心的叫做地心天球,以太阳中心为球心的叫做日心天球。{celestial sphere; imaginary sphere of infinite extent with the observer at the centre and a radius of appropriate length; The celestial sphere with the earth's core as the centre is called the geocentric celestial sphere, and that with the centre of the sun as the centre is called heliocentric celestial sphere.} |