下中天
- 网络lower transit;Imum Coeli;lower meridian passage
下中天 下中天
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(1) [lower culmination]∶拱极天体经过可见天极与地平线之间的那一部分天球子午圈
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(2) [lower transit]∶天体每天两次经过观测者的子午圈,其中离天顶较远的一次
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在上、下中天观测，地球自转角速度的变化对脉冲星的周期变率的影响较大。
While observing at upper or lower culmination the effect on the rate of change of the pulsar period becomes larger .
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认为，在原理上卯酉&子午交替观测法测定的纬度值是绝对的，而传统的拱极星上、下中天法不是真正绝对的；
It is suggested that in principle , the latitude values determined by means of the former method are absolute , but those determined by the latter method are not really absolute .
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每日事件对话框会出现，并显示升起、落下和中天时刻。
The Daily Events Dialog will be displayed , showing the local times of rise , set and transit .