例句與造句

1. They are used for the measurement of small differences of zenith distance, and used in the determination of astronomic latitude.
2. The method fixed latitude by observing differences of zenith distances of stars culminating within a short time of each other, and at nearly the same altitude, on opposite sides of the zenith.
3. It's difficult to find difference of zenith distance in a sentence. 用difference of zenith distance造句挺難的