Danjon astrolabe

例句：

1. 1. The Danjon astrolabe was a crucial tool for navigation during ancient times.
   古代，天文学罗盘是导航的重要工具。
2. 2. The astronomer used the Danjon astrolabe to plot the positions of stars in the night sky.
   天文学家使用天文学罗盘来在夜空中定位恒星的位置。
3. 3. In medieval Europe, Danjon astrolabes were often made from wood and metal, and they were highly prizedfor their accuracy.
   中世纪的欧洲，天文学罗盘通常由木头和金属制成，它们因其准确性而备受珍视。