radius astronomicus造句

例句与造句

1. The Jacob's staff, when used for astronomical observations, was also referred to as a "'radius astronomicus " '.
2. Horrocks owned a three-foot " radius astronomicus "  a cross staff with movable sights used to measure the angle between two stars  but by January 1637 he had reached the limitations of this instrument and so built a larger and higher precision version.
3. It's difficult to find radius astronomicus in a sentence. 用radius astronomicus造句挺难的