Horizon

Japanese: 地平線 - ちへいせん

〘noun〙 The boundary between the sky and the earth as seen from an open vantage point. A great circle formed when a plane perpendicular to a vertical line at a certain point on the Earth's surface intersects with the celestial sphere. *Shogaku Yomiuri (1873) <Tanaka Yoshikazu> 4 "If a straight stick is floated on the surface of the water, the position of this stick is the direction of the horizon." [Additional note] This is shown in the diagram at the bottom left of Matteo Ricci's "Kunyu Bankoku Zenzu" ( 1602 ). In the explanation, the horizontal line drawn down the middle of the circle is called the "horizon" and the vertical line the "zenith," but the diagram says "horizon."

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙眺望の開けたところで見える空と地との境界。地球表面上のある地点における鉛直線に直交する平面が天球と交わってできる大円。※小学読本（1873）〈田中義廉〉四「もし正直なる棒を、水面に浮めるときは、此棒の位置は、即ち地平線の向きなり」[補注]マテオ‐リッチの「坤輿万国全図」（一六〇二）左下方の図に記されている。解説では円の真ん中に横に引いた線を「地平」、縦に引いた線を「天頂」と呼んでいるが、図には「地平線」とある。

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