上中天
shàng zhōng tiān
- upper culmination;upper transit;superior transit
上中天
上中天[shàng zhōng tiān]
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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 .