| 单词 | Zenith sector |
| 释义 |
Zenith sector
原声例句
万物简史 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的三角测绘法，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的运动。
英语百科
Zenith telescope  A zenith telescope is a type of telescope that is designed to point straight up at or near the zenith. They are used for precision measurement of star positions, to simplify telescope construction, or both. A classic zenith telescope, also known as a zenith sector employs a strong altazimuth mount, fitted with levelling screws. Extremely sensitive levels are attached to the telescope mount to make angle measurements and the telescope has an eyepiece fitted with a micrometer. They are used for the measurement of small differences of zenith distance, and used in the determination of astronomic latitude. |
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