Meridian passage - Shigosentsuuka

Japanese: 子午線通過 - しごせんつうか
Meridian passage - Shigosentsuuka
The diurnal motion of the celestial sphere causes a celestial body or its center to pass through the meridian. A normal rising and setting star is observed once a day, when the celestial body is due south (or due north) and its altitude is at its maximum. A circumpolar star occurs twice in total, once above and once below the north (south) celestial pole, and is distinguished as an upper meridian passage and a lower meridian passage. → Noon → Related topic Local time

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
天球の日周運動により,ある天体またはその中心が子午線を通過すること。ふつうの出没星では1日に1回観測され,このとき天体の方位は真南(または真北)で,高度は極大となる。周極星では天の北(南)極の上と下で合計2回起こり,上方子午線通過,下方子午線通過として区別する。→南中
→関連項目地方時

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