zenith astrograph

例句：

1. 1.The astronomer used the zenith astrograph to map the stars.
   这位天文学家使用天顶星图来绘制星星。
2. 2. The zenith astrograph was a revolutionary tool for mapping the sky.
   天顶星图是绘制天空的一场革命性工具。
3. 3. The zenith astrograph helped scientists discover new planets in the outer reaches of our galaxy.
   天顶星图帮助科学家在银河系外围发现了新的行星。