a great circle on the celestial sphere passing through the zenith and perpendicular to the horizon
In astronomy, a vertical circle is a great circle on the celestial sphere that is perpendicular to the horizon. Therefore it passes through the zenith and the nadir.
例句与用法
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Index error of vertical circle 竖盘指标差
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The paper mainly consider the followings : the performance parameter determination of cryopump , heat load determination and heat transfer of large cryopanel , reasonable distribution of heat load , the condition for construct steady flow in small vertical circle pipeline , balance condition for gas and liquid two - phase flow in the connection pipe between cryopanel and dewar , the safety of cryopump 文中探讨了低温泵性能参数的确定；大抽速低温抽气面的热负载的确定及合理分配；冷凝面上竖直圆管内受热建立稳定流动的条件；冷凝面与杜瓦间的连接管道内气液“双相流动”的平衡条件；低温泵系统运行的安全问题。
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