Position angle - isotropy
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A celestial angle is a measure of the relative position of two points on the celestial sphere. It is the angle between the first point and the second point on the celestial sphere, and is made by a great circle drawn from the first point to the North Celestial Pole and a great circle connecting the first and second points. The angle is measured in the direction of the clock, with the North Pole as the zero degree. Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
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〘名〙 天球上の二点の相対位置を表わす要素の一つ。天球上で第一の点に対して第二の点の位置する方向を示す角度で、第一の点から天の北極に引いた大円と、第一の点、第二の点をつなぐ大円とがなすもの。角度は北極方向を零度とし、時計の針のむきに測る。
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