…If the longitude of a point is Λ, the change in latitude is related to the position of the polar motion at a certain time by ⊿φ= x cosΛ+ y sinΛ. x and y are called polar coordinates, and represent a point on the orbit traced by polar motion in Cartesian coordinates. Polar motion is represented in a coordinate system with the mean position of the North Pole as the origin, the x- axis pointing to 0° longitude, and the y- axis pointing to 90° west longitude. … *Some of the terminology explanations that mention "polar coordinates" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…地点の経度をΛとすると,緯度変化はある時刻の極運動の位置と⊿φ=xcosΛ+ysinΛの関係がある。x,yは極運動座標と呼ばれ,極運動の描く軌道上の1点を直交座標で表したものである。極運動は北極の平均位置を原点とし,経度0゜方向をx軸,西経90゜方向をy軸にとる座標系で表すことになっている。… ※「極運動座標」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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