Meridian passage - Shigosentsuuka
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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 |
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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 出典 株式会社平凡社百科事典マイペディアについて 情報 |
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