There, the astronomer Jean Picard devised an impressively complicated method of triangulation involving quadrants, pendulum clocks, zenith sectors, and telescopes for observing the motions of the moons of Jupiter.
在那里,天文学家让·皮卡尔发明了一种极其复杂
三角测绘法,用上了扇形板、摆钟、天顶象限仪和天文望远镜用来观察土星卫星
运动。