rightangled triangle 中文意思是什麼
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At sea, septentrional, by night the polestar, located at the point of intersection of the right line from beta to alpha in ursa major produced and divided externally at omega and the hypotenuse of the rightangled triangle formed by the line alpha omega so produced and the line alpha delta of ursa major
將大熊星座的「貝塔阿爾法」這一直線延長至星座外的「奧墨伽」 ，北極星便位於「阿爾法奧墨伽」這道外部區分線與大熊星座內的「阿爾法德爾塔」這一直線所形成的直角三角形斜邊的交點上340 。
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