Prime vertical
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A great circle that passes through the zenith and is perpendicular to the meridian. The two points where the Rabbit and Rooster line intersect with the horizon are called the east point and the west point. Rabbit indicates the east direction and Rooster indicates the west direction. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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天頂を通り子午線に直交する大円。卯酉線が地平線と交わる2点を東点，西点という。卯は東，酉は西の方向を示す。
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>>: Bouyugi (English spelling) prime vertical instrument
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