Lower meridian passage

Japanese: 下方子午線通過 - かほうしごせんつうか
Lower meridian passage

…Normally, a rising or setting star crosses the meridian once a day, but a circumpolar star may pass above or below the celestial pole, making it twice a day. The former is called an upper meridian crossing, and the latter is called a lower meridian crossing. …

*Some of the terminology that refers to "lower meridian passage" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ふつうの出没星の子午線通過は1日1回であるが,周極星では天の北(南)極の上方を通過する場合と下方を通過する場合があり,1日2回となる。前者を上方子午線通過,後者を下方子午線通過として区別する。南中【湯浅 学】。…

※「下方子午線通過」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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