On the contrary, an object reaches its lowest position when passing through the semi-circle which includes the nadir and the nearest celestial pole, and this phenomenon is called lower culmination.
英
美
- 經(jīng)過(guò)包括天頂的那半個(gè)子午圈時(shí),天體到達最高位置,稱(chēng)為上中天。經(jīng)過(guò)包括天底的那半個(gè)子午圈時(shí),天體到達最低位置,稱(chēng)為下中天。
